My play group is starting to get into the game, and there is a weird rule I cant wrap my brain around. If you are Taken out, do you still get to change stances when it comes time for your heroic spirit turn? It seems weird that you could swap into bleeding/ Zombie and just negate threat by damage that way.
Even more so when something like Angel/ Cavalry doesn't have access to that .
Is there some kind of vulnerability I am not seeing here?
Yes, you do get to change stances (second paragraph, page 31). Of note is that the Vigilance stance heals itself at the start of its turn, meaning that all archetypes can spec into the ability to stand themself back up.
A special note for Angel- as mentioned on page 61, the Angel Ability lets them get back up even when damaged, since it heals them.
The primary counter, as I see it, is to avoid focusing damage on foes who will just regenerate off your damage, or by 'wasting' their healing by only dealing small amounts of damage to them - you win by getting everyone to 0 HP, in whichever order that involves.
