Regarding physics. If grease removes friction and therefore somehow counteracts drag, then the explosion's shockwave wouldn't have accelerated him either. It would just have moved past him. Even if not, the acceleration seems extreme. Did he also use mass damper and inertial damper fields (same thing?) on himself? Mass, so he travels with the speed of the shock wave and inertial as he wouldn't be crushed.
But don't sweat the details. You gotta love the abuse of the system.