How were you able to use the Darkness within while carrying him? You need to be adjacent for it to work

Right here. However, you only heal 1 or 2 66% of the time with regen, so it'll put him back on HSS more often than not.

yup it works i used to use it on dr donald blake before i traded him. Its one of the easiest ways to get con artists onto perplex too

I'm still not sure why one of the little boy versions of Billy is capable of Charging, Quaking, and Flying ...

well you could spend the 5 points and bring him into the battle right away, move him into position at double the speed value and activate him, if you plant him next to somone (preferably one who has an action token on it) hes in battle or if you push him on the next turn to attack he takes a clix but hes in the frey at least. It all depends on your style...