That looks similar to what happens when you run a fancy pants graphically heavy game on a not-nearly-good-enough PC. The particle effects and what not get rendered as colored rectangles of varying size and transparency. So yeah, frame rate prolly slowed down and that’s what ya get.
Halo 3 Screenshots 
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I demand explanationz.
Looks like good timing and a gravhammer + Shield Drain/Plasma Grenade. I could be wrong but thats what it looks like to me. =)
Mod? It looks like a heat map.
I didn’t get the impression it was a mod. Here is the thread I found it in :
http://www.bungie.net/Forums/posts.aspx?postID=21250678
Yeah it looks like it was just a freak occurrence, and I bet that the “square” was only there for one frame.
ya..it looks like maybe the game was lagging and the “gravity distortion” from the gravity hammer somehow became visible
whoa, that is freaky and lucky
i think my xbox was broken when this occured lol
I’LL SEE YOU ON THE OTHER SIDE!
That looks similar to what happens when you run a fancy pants graphically heavy game on a not-nearly-good-enough PC. The particle effects and what not get rendered as colored rectangles of varying size and transparency. So yeah, frame rate prolly slowed down and that’s what ya get.