Scorpion (MK) and Ryu (SF3) vs Sheik and Master Chief

After MK vs SF 2, Scorpion comes back and he and Ryu team up against Sheik and Master Chief.

Sheik has every feat except those of SSBB.
Chief has an energy sword, a sniper rifle, 4 plasma nades, and 4 spike nades.

This will be a 2 round match.
First round takes place in Brawl stadium, at the very beginning.
Second round takes place in the MK3 Pit.

After round 1, Chief will be again fully loaded.

Which team wins?

Spite. Team 2 is the most likely to win, but only because of Master Chief and the weapons you gave him.

Grats, Sheik outside SSBB has few feats. Though she does have TK and some magic. Not enough to give her a definitive win over Ryu.

Chief wins though.

Team 2. Chief takes it.

Ryu and Scorpion can't really harm Master Chief. I'm really not too sure what Sheik can do outside of Smash Bros but she should be able to use Zelda's abilities.

Team 2 wins with at least one head shot and one energy sword kill.