First they helped Rudy the elf track down Santa, which only humans can do (see november 25), and then they helped to activate the Christmastide to summon the representations of the other holidays to back up Santa.
It might be a reflex, but Miles’ dialogue suggests otherwise, as he notice he and Kevin have been send back to the exact moment they where originally taken.
That bird is the representation of Thanksgiving. Speaking of which, doesn’t she have other places to be? In-universe this story is set around Thanksgiving right?
Miles has truly improved his hide and seek skills since 2019/06/07. That time, he forgot to search.