The Titan in the E3 Demo threw grenades, which are probably handled as a Super as there's just no button real estate for a grenade throw button. Not to mention we don't truly know the exact nature of Space Magic. Is the drop shield abillity the manifestation of the user's willpower? Or is it simply the result of shield emitters in the palms, some kind of technology? Is that technology space magic?
Yeah I would presume the drop shield would be a manifestation of the user's willpower (space magic). And LB would probably be used for both grenades and the drop shield type abilities.