Normally mutants run and hide from Sentinels, that is if they've lived the civilian life most of the time...And a well trained mutant could defeat a single Sentinel, and only the exceptionally strong and skilled could take out a multitude of the mutant-hunting automatons. Especially if you're an Omega Level mutant like Omni. The MRD had deployed 15 sentinels to take him out, unfortunately he overwhelmed all of them with bother power and cunning.

MRD Soldier 1: He's still standing! Get ready to intercept!!!

MRD Soldier 2: Just What the hell kind of mutant is he?!

Omni: The most powerful one on the face of the Earth....*creates a plasma scythe made of psionic energy*

—Now prepare to die....