As much as I love Guren, he wasn’t exactly doing all that hot against Mika, and would have lost in a one-on-one bout eventually. The reason why he stood a chance before Ferid interfered was because he never intended to fight Mika one-on-one in the first place, utilizing his squad’s teamwork from the start, and because Mika was too arrogant at first and seriously underestimated him.