The funny part about this turn is that resonance dragon's counter blast effect hasn't been used yet, meaning that she still had one more attack left despite all of that.
When Lianon Vivace stands 3 units, can't she get the 5 unit boost again? Or is it once per turn? I think that would be the reason why it stands the vanguard, so it was weird to me that Urara didn't do it.