Take cover -- wait for dust to clear, examine scene, fire on hostiles.
The dust clears, revealing many crates and barrels, with some slight movement behind them, dead bodies litter the ground
Doc:
Rescue Sean, secure him, and continue fight.
Scott:
Defend the Doc.
The enemies are far too busy pissing themselves to fire at you, so you get to Sean uninterrupted.
"I-I jusst got the wind knocked outta me" he mumbles, getting on his feet