What if someone switches vessels in the same combat round that they get hit?
All things are simultaneous in a round in basic combat. So, both happen, the celestial gets hit and switches vessel (in other words, the original vessel is the one damaged). Whenever that celestial switches back, that celestial will find their vessel in the condition as if the hit took place. This might mean that the vessel is unconscious or even mortally wounded. In advanced combat, follow the order given on p. 68 or on the GM’s screen. In this case, switching vessels is a supernatural power which happens before getting hit. Remember that each vessel has its own supply of Body hits, making an alternate vessel much more attractive a choice!