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 model 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.
Ikaros' self-analysis while deflecting the Melans' Artemis is a dual CMOA for both Ikaros and Melan.
Ikaros: Difficulties in Aegis II deployment. Reaction speed delayed by 3.5 femtoseconds. Adjusting. (cue direct reflection into attacking Melans)
Report Siht: Okay, so not only is Ikaros now absolutely badass enough to consider 3.5 femtoseconds a consequential delay, but the Melan models fire Artemis with such strength that 3.5 femtoseconds prevents a desired reflection. I'm going to clean up my brain now.
How can you forget Delta breaking her own slave collar? Especially considering that the other Angeloids all couldn't do it.
Chapter 62: The Harpy Twins are back, Nymph is not in a good mood, Ikaros resigns herself to a fight and starts powering up... and Tomoki walks out, armed with a fishing rod and summer clothes... and this happens.
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 it's still impressive for a normal human.
Before that happened, at the end chapter 67, Yoshitsune's reaction to seeing how Sugata was treated by his own family is to bust into the Sugata household with a fire truck, making sure Sugata's kid brother is out of harm's way by letting him drive said fire truck, and proceeds to call out Sugata's old man. When Mr. Sugata orders his guards to throw him out, Yoshitsune resists with all his might, even going so far as punch some of those guards out, even as the rough him up.