Necrosis said
Taking down your average knightmare is fine. The more advances one (like the ones the main characters use) will be able to take a few shots before going down.
And they'll be moving. He also is extremely skilled in combat, so being stuck in human form will be a challenge, not a impasse.
And I'm curious on the effects of Dark Energon on a Knightmare ... wonders if he could create an army of sentient knightmare frames from it ...