It would be helpful if the UI made it clear which troops are “wounded”, for purposes of triggers like Crimson Bat’s Bloodsucking trait or Wolf Knight’s spell.
Originally I thought it was based on the troop’s health (the number itself, not the heart) being colored yellow. But that doesn’t seem to be correct.
I just tried Crimson Bat’s Bloodsucking against a boosted Jarl (+12 life from team bonuses, +3 from Leadership, +4 from 2x Giant Bond, +4 from 2x Huge activations, and then -1 life from taking 20 damage with 19 armor). On my next skull match, Bloodsucking did in fact trigger, even though Jarl’s health was still colored green.
The concept of wounded doesn’t seem to be reflected in the UI anywhere that I can see.