Zevka: Some enemy jumps to you and take your weapons.
Kondeki: I actually just figured this out recently. I never noticed the rolling enemies - or those who appear to roll - steal my weapons.
No wonder you didn't figure it out in the first place (neither did I) because the animation for that "steal move" is ridiculously bad. The enemy soldier just "magically" slides back and forward really quick. Some guy on another forum even thought this was some kind of bug/clipping issue.
IMO they could at least have done a proper script event where the enemy soldier struggles for a moment to pull the weapon out of your hands or they could have left it out entirely.