Angelina was evidently graceful, like a butterfly, and she couldn't possibly carry out the sort of unrestrained, barbaric offensive often seen in men. This was inherently at odds with the philosophy of the restraint style she adhered to in combat. It was because Feng Yi felt he understood Angelina to some extent that he personally thought she was likely doomed in this fight.
And indeed, as people witnessed, she slowly collapsed after 3 minutes...
However, just when everyone thought it was over, the mecha stood up again, albeit with difficulty. Everyone has something they need to protect—like honor—and Angelina didn't want to give up on the fight so easily.