Flying Half-Jaw

In The Oracle, when you first encounter the Flood, it is possible to make "Half-Jaw" fly in the air anytime he is attacked by an Infection form

To do this, you must make him your enemy at the very beginning.

This is simply done by killing everyone on your team (both Elites and both Grunts). Defend yourself until the Heretic Leader's hologram appears.

At this point, Half-Jaw will become an ally again and help you fight the Flood that soon attack.

Whenever a infection form jumps onto him, he will attempt to hit it with his energy sword. After a couple of strikes, he will fly through the air.

You can also do this with any character and the Sputnik skull.