Oddities losing 1 hp when they attack after a crit
Me (Auror) attacking a Poacher (or a Fluffy) with 300 hp:
I attack, critical hit: 261 damage, Poacher is left with 39 hp
Poacher attacks, deal damage to me and loses 1 hp, leaving himself on 38 hp.
This only happens when my attack is a critical hit.
This happens regardless of me casting Protego or not to defend against his attack.
I've just tested it in a fortress as well and it looks like this only happens after the very first attack. An Acromantula that I critically hit on the first attack lost 1 hp when it attacked me, but an Erkling that I didn't critically hit on the first attack, but did critically hit on the second attack, didn't lose 1 hp when it attack me after my first and second attack.
Another Auror I spoke did 270 damage on a critical hit versus a Poacher, but reported that the poacher didn't lose 1 hp after that.
Protego Power 32%
Critical Power 111%
Proficiency Power 129%
Deficiency Defence 39%
Defence Breach 7%
Maximum Focus 9
Charm, Hexes and Specialization maxed.
Samsung Galaxy S9, Android version 10
Game most recent version.