Does anyone have any explosives or something
Iso had flashbangs, but I doubt they'd really do much.
What is the drone holding? A knife? Does it have any other weapons? And since you said that it only drew a little blood, I'm assuming Dex still has full health? What's the drone's health, or is that unknown?
Have Ereo try and grab Iso to get him away from the mech. Have Dex go over by Alan and have them both fire at the drone.