He not only repeatedly runs out of ammo with Heavyarms but he's the ONLY PERSON in the entire series to not only exhaust ONE but TWO BEAM RIFLES!!!!
In the episode "Trowa's return to the Battlefield" we watch him run out of ammo with something that SHOULD NOT RUN OUT OF AMMO!
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Gotta love a man that will "shoot his wad" to the point of exhaustion every time.
*SNERK*