Do bitten werewolves only shift into battle form (the inbetween form)? And do other strong emotions besides anger force a shi

There is no full wolf change for a cursed werewolf. It is only the battle form they change into when they do. Other strong emotions do not force a shift from them. Also, it's very rarely something that happens because of anger alone. It has to be pure rage that drives it--which generally leads to some form of violence, which in turn forces the change.

In a situation of violence causing the change, generally speaking it does because of damage taken by the werewolf. Now, a change won't be triggered by a papercut. It'll need to be significant pain and damage taken to really trigger that change, one punch won't do it either.

Most werewolves will try to either avoid that entirely, or back out of situations that might inadvertently trigger a change. Moral werewolves don't want to go on rampant killing sprees, the ethically devoid just don't want to get themselves killed--and sprees tend to draw attention.