After waving Gordon off, Grigori continues fighting the hordes of enemies until he retreats into a nearby tomb, ignites a wall of fire around it and disappears laughing maniacally, suggesting that Grigori died fighting as Gordon was forced to keep going.
Grigori continues fighting the hordes of enemies until he retreats into a nearby tomb, ignites a wall of fire around it and disappears laughing maniacally, suggesting that Grigori died fighting as Gordon was forced to keep going. Grigori was waving Gordon off.