Click the flag several times. However many times is up to you, just do it more than once. Sync issues in this animation should not be as severe as the previous tournament fight of mine as the music does not use pitch effects to skip to another part while preserving audio quality that would otherwise be decreased by Scratch.
Music by Teminite, titled Beastmode. Sounds taken from Spiral Knights by Grey Havens, Half Life (2) by Valve, and other sources. Some are unknown to me.