He later uses that ability to fire a freakin' huge laser beam in a duel against Ikaros. Yes, it was a gag episode, but it was still insanely awesome.
In Chapter 56, defeating just 1 Melan left Ikaros beyond repair, which activates her Pandora system. Reactivation and calibration of the new Aegis and Dual Variable Wing systems destroy most of the enemy reinforcements, and when Ikaros returns to normal operational mode, Artemis destroys the remaining forces with barely any effort.
How can you forget Delta breaking her own slave collar? Especially considering that the other Angeloids all couldn't do it.
Yoshitsune manages a crowning moment of awesome in chapter 73, by taking on 4 melan ikaros's just to save sugata, he doesn't make it in the end but its still impressive for a normal human.