To be clear Quake is now on the sholder of the Archon next to Sunna. It's sort of a mount I guess?
Quake is severly injured but if the Archeon can aid and he uses a cure ability then he will enter the fight.
If Sunna moves into enguage and the Archon also follows then best possition te Archon so Quake has access to the shadows square (he will then get a full round action?)
Note: with the +2deflection and +2 from cover and small size +2 he has a lot better AC vs them now, just needs a few HP to play with
GP