Oh, geez! It wasn't just Sasha derping up at play here. This man was scolding her, and Sasha didn't always take well to being scolded. "My magic is not useless! It's just not very useful right now, thank you very much! Besides, summoning a Persona takes precious seconds extra that those things could've used to swarm me. Wouldn't you try the faster tactic at first, too?"

Sasha, just admit that you screwed up and really should have taken those few extra seconds out to use your Persona, swarm or no swarm.