When Twitch users played Pokemon, it kinda made sense. That's a game you can break down into simple movements. Halo? That's a pretty complicated game! Which might explain why this stream is so funny.
If you were watching a single human wander around the dead corners of the map, shooting at rocks and aiming at the sky, it'd be boring as hell. But watching a crowd of people fight over inputting single commands, which might get Master Chief killed or might somehow actually save his bacon, is a lot more fun. Especially if you imagine that Twitch is playing the role of a very useless Cortana.
At time of writing, people were trying to get him over a narrow bridge. And had been trying to do it for hours.
You can watch the stream below.