The abilities that transform a Werewolf back and forth look at the entire previous turn, even if the Werewolf with that ability wasn't on the battlefield for some or all of that turn.

You can activate Duskwatch Recruiter's first ability in response to its triggered ability.

Krallenhorde Howler's first ability can only reduce the generic mana portion of a creature spell's cost.

Krallenhorde Howler's first ability can reduce alternative costs such as madness costs.

To trigger the Werewolf's back face's transform ability, a single player must have cast two or more spells during the previous turn. If multiple players each cast just one spell during the previous turn, the ability won't trigger.