I think this could also be part of how you sometimes get double/multiple Orbweaver summons seemingly out of nowhere, aside from when triggered by multiple skull matches?
And I agree this is probably how it happens, and it makes sense in terms of the order in which the different pieces of damage occur and board resolution (match, explosion, explo-damage to the next troop now that the first is dead). Iām wondering whether or not I like it . Could almost be an incentive to not use explosion-traited troops/heroes .
It might be a possibility. However, it is a bug and should be fixed if indeed it works like you think. Basically, the sequence in this case is:
-1. Skull match 4+ kills a card on top of Orbweaver.
-2. Card dies and is removed.
-3. 4+ match triggers an explosion.
-4. OW takes damage from the explosion and summons.
-5. Damage is not displayed because the other part of the resolution that registers damage processes the sequence as 1-3-2-4 and not as 1-2-3-4.
6. Something else happens, like end of move or end of turn or whatever else, and a resolution of this discrepancy is triggered, which resolves a mismatch between two triggers.
This may mean that different triggers resolve the same sequence differently. Eventually some sort of a sync between them is triggered somehow. Wow, that is very messy. Some really large cascades may have dozens of triggers. As the game tries its best to do it in real time, the errors and mismatches are essentially unavoidable and have to be cleaned up at some point.
Anyhow, a simple solution for this annoyance is to make this particular trait trigger once per turn aka Krakenās damage.
I wish somebody takes a look at all this mess and cleans it up. It is probably possible but seems very unlikely.
Internet is crazy slow, but Iāll try to post a link when fully uploaded. (Went from 37% to 39% while typing all of this).
Basically, Zuul killed Fist of Zorn, Monk kills Orbweaver. Triple spawn. At least it wasnāt GW. Or would I want 3 spiders so I get credit for more damage?
In this case Iām thinking three separate skull matches counted as three separate instances of āwhen I take damageā, which all successfully triggered a Giant Spider.
I donāt think thatās necessarily ābuggedā so much as ānot something that was thought aboutā in the implementation of the trait and skull converters, and is a bit eugh.
At least in this case the Orbweaver hero actually took damage rather than it being soaked up pre-emptively by the summons that needed the hero to take damage to be summoned in the first place actually no one taking any damage (Orbweaver probably had an undisplayed -1 skull explosion damage or similar), unlike:
Iād actually be very much in favour of all these damage sources being lumped together as one damage hit per cascade for battle resolution mechanics, meaning youād only get 1 Giant Spider when converting multiple skull matches, although if that lead to a subsequent skull drop cascade, each of those could count for another source of damage.
This are a couple of other traits/mechanics that would be affected by this, they donāt come to mind currently, but I donāt think it would really have much of an impact, and Iāll come back and edit if I remember.
I thought that was the case for dodge: Egg Thief (or another opponent) gets one roll, and either dodges all skull dmg, or none of it. I have no basis for thinking that, which is why I rarely bother thinking. But I thought it came about when Kraken was nerfed from 3 dmg per 4 match to one per board.
And thanks for the screen grab, plus analysis. Cheers.
I am curious as to what would have happened if a Doomskull was involved. Would that have triggered a 4th Spider, or would it have been calculated separately and had dmg applied to the first spawned. I shall keep an eye out in future battles. At least it canāt spawn a fifth. I donāt need any more fifths in my life.
If this happens again, can you click on the Orbweaver hero to see if itās taken explosion damage but just not showing it (like what sometimes happens with Egg Thief)?
I often play on my phone, so am not easily able to record things, sadly.
It was not the visual bug where you can click on the troop and see the actual health while the one on the battle screen seems untouched.
But even if it were to of been damaged that would be a bug in itself.
Iām guessing this is still a thing, as I fought a nerfed (allegedly) Orbweaver team. I do apologize for no capture.
5 spiders into the match (Firebomb, Orbweaver, Battlecrasher, Lust), me with stupid skull dmg team (and Sister Superior, to stun the visible 2 Lusts), top spider has 8 health. Orbweaver 6 health. I cast Qilin, kills Spider with 4 match skulls, and a 6th spider spawns. Orbweaver still has 6 health.
Again, apologize for no screen grab. Guess I should be thankful it didnāt spawn two (no room). And thankful I won. Eventually.
Hey team, we struggled to reproduce this, but have pushed a fix we think should solve the issue. Please let us know if the issue persists so we can look into it again!
Bump/necro that this visual bug still exists and can be reproduced very dramatically now with giant walls of 40 doomskulls from Xenith and an agile troop. I donāt have video but it just happened to me with a jewel gnome, dodged almost a full board sized doomskull blob and did not show the massive explosion dmg . Maybe someone else can capture the evidence
For example, when you match a Doomskull, if there are any adjacent Skulls (otherwise not part of the match) then this seems to cause a second āhitā of Skull damage that is NOT animated at all, resulting in weird things like a weakened troop dying without visible cause.
Compare that when casting a spell that causes direct damage and also destroys/explodes gems, you will see two damage numbers: one for the spell and one for any skulls that may have been involved.
(I have caught these on video and can show as needed.)
. Could almost be an incentive to not use explosion-traited troops/heroes 
.
