His hit successful, Tai glanced over as Greyson did a follow up, before shifting back to let Priscilla and Robert finish the thing off. He was adequately satisfied by the whole affair. Perhaps he hadn't shown his utmost potential, but it wasn't like this was entrance exam, it was to make a team. There was plenty of time to show further layers as they year went on. 

Then the thing fairly exploded, Priscilla having apparently phased through the ground and into the thing somehow, which he found odd and led to him wondering about the limits of her Semblance, since the average person would assume that there was no open space inside a Grimm for her to become solid again, and thus she wouldn't be able to harm it when she was inside it. But apparently he was wrong. Glancing around, he saw that any Grimm left had decided that discretion was the better part of survival and fled. 

Walking over to the dissolving Grimm corpse, he gave it a once over of the aftermath, wondering as well how it had gotten there, nodding quietly in response to Robert's compliment, before returning to the group. "Yes, we should head back to our start point," he confirmed. He figured they would all prefer to leave the Grimm infested area as rapidly as possible. "I also believe that the teachers will be assigning team leader," he added.