I mean this was just straight dogshit. He turbo-sandbags by summoning a single person when we know he could easily summon what, at least three of those, plus box her in with advanced golems while pissing out flying swords towards her the whole time.
And then when his one summon doesn't win 1v1, we're supposed to appreciate how good it was that he had friends to back him up?
It feels so fake and unearned. He's challenged to a fight, tries like ~5-10% of his best, and loses. It's just frustrating.
Who gives a shit if she disrupts magic? Better question:
What's her next move when three singularity-killing divine beasts surround her and attack at the same time?
If he tried at all, he would just win within a second. There's straight up no time to dodge or guard, let alone counterattack against the amount of shit he can instantly and constantly pull out of his ass.
I hate this trope of main characters that are way too strong for the story the author is trying to tell. If he has to forget to use 90% of his abilities to lose, then just make him lose off-screen. It feels about as earned anyway.