I like the scene in Collateral, but find at least one flaw in Cruise's character's techique: He moves between the two BG's.
Had Vincent performed the deflection on BG1 while moving to his left (BG1's right) - IE the outside of the pair - he'd have put BG1 between himself and BG2.
That might have made BG2's "bobble" unnecessary.
There are actually tactics one can learn for dealing with multiple adversaries. Will they always work? No. Will they often yield higher survival percentages than would going in full frontal? Most definitely.