I tested this in AV on my priest with other members on the ally side.
when someone died in AV and released to go to the spirit rezzer, I used resurrection on them and it went through. upon them accepting the rez, they appeared next to me but not at the designated hp. they ended up just spawning and flopping over and dying again, forcing them to release again.
it was a huge issue considering this could affect pve mechanics as well in raids.