@Ven Through the holiest of wwhite sciences and the willing suspension of disbelief.
Seriously though, Knife's respawning just happens.
"Nice to meet you Galen, now if you excuse me, I think I'll just sit a while." Knife says, sitting on the edge of the building and watching whatever battles are still taking place.
OOC: That's me done for the night (Or, morning >.>)