Colosseum Glitch and Horse Assassination
http://www.youtube.com/watch?v=H2eHzM2SjRM
This is a glitch that happened to me during the Colosseum mission. When I go to my recruits to be disguised as a Roman soldier there was no scene. I'm not sure what caused this, at first I thought it was because I jumped over the scene start, but then I tried simply walking over it and the same thing happened. During this short time I climb up behind the stage and call a horse. I can then mount the horse but can't dismount or do anything but walk slowly with it. When I can finally do high profile actions on the horse I air assassinate Micheletto Corella. Another thing to know is I can't move with the horse when getting into place by the stage, and I have to wait for my recruits to get into place before I can move again (one time one of them got stuck somewhere and I had to restart the memory).
Hahaha nice! I hope you can figure out how to trigger the glitch. Pls share with us if you do
At least someone found something to do with this EXTREMELY scripted mission. 
I think the xbox360 is a little messed up (sometimes when it autosaves the screen stays white and you can't move while it's like that, also happens for ac2). Or maybe because I had an improper weapon sheathed? Probably not. Anyway I had originally tried to make a variety pack when I encountered this glitch (see if anyone can make this happen by jumping over the screen start), so I decided to record that by itself. I only did a few other stuff besides that, like dropping a weapon from a guard by the stage then picking it up before the assassination (basically a continuation of how Ian used the spear, except with other weapons). Anyone think I should try making a variety pack?
i tried to reproduce this by having a shovel sheathed (elm street from red-handed), but it didnt work. any other ideas come to mind on what causes this glitch?
Well i tried to intiate this glitch to. I found success from hitting the checkpoint marker while air-borne. That caused the glitch for me. But it didn't work always.
But for the most part, being airborne while tagging the checkpoint triggered the glitch for me, about 50% of the time
arrrogance, do you play on xbox?
yes i do
Well now we know this glitch works sometimes, although I only have to walk in the checkpoint for the glitch to happen. People on other game consoles could try other stuff to attempt to glitch it up:
Jump high over the checkpoint.
Hover over it with a parachute.
Jump over it while on a horse.
Perform a kill animation while going over it.
Get into a fight with a civilian and walk over it.
Someone please try stuff like this and see if they can make something happen. 