I heard that Tsunami where told stacking Xt was not enough to win the fight, which is why they tried to flip them out
But...
I think it was correct of Refbot to right Supernova
I think I saw in the backround Storm II attacking Shunt first
I think Supernova should have won, though Storm II should not have been left on the side like it was. Bad luck that they ended up wrong way up but wrong that they where kept at the side. Hope that makes sense.