Unshielded U-Mos
From M2K2: Metroid Prime 2 Wiki
Unshielded U-Mos
by TechnoMan Contributor: TechnoMan
When you go back to U-Mos to claim your Light Suit, watch the little cutscene when you talk to him. After that, don't collect the suit. Try shooting U-Mos instead. There will be no shield to reflect your shots.
It's just a useless observation though.