Lacking
Nicely animated, but there some things that were lacking. Usually madness tends to revolve around more high speed action. This seemed slow and drawn out. Another thing that bugged me was the length of the film overall. For most animations this isn't an issue but like somebody else said he was just getting started and it was over.
Also, uhm, I think you have your portals confused. When he shot the portal right below the gun that dropped off the other guy the portal on the right side wasn't created yet. It shouldn't have ended up there.
You really could have expanded this more.
(On a minor note the other portal is orange, not red)