He noticed Cas among the applicants
Cas was just WRECKING bots, turning into various animals to destroy them. He had a definite sense of showmanship-he knew what he was doing and how to get people's attention.
Cas had 7 and was finishing up his 8th. He was thoroughly engrossed in the fight-he seemed like he was in his element. And damnnn did he look good-
Cas wasn't even in the area anymore-he had gotten ahead of the others. And Bakugou had no way of knowing how many bots he'd already gotten...
He didn't see Cas on the way back, but he was already at home base when he got there