Mind of tempest
(he/him)advocate for 5e psionics
ah, I know exactly what you mean.It's a Clip from 1984's Dune in which Paul Atreides is forced into a knife fight while surrounded in the most ridiculously badly designed cuboid force-shields. The whole point of which is that you have to stab your opponent -slowly- to pierce the force field because it reacts differently to slow moving objects than it does to high speed objects.
Like a Non-Newtonian Fluid as Armor.