Pics for people who don't have the pleasure of knowing Mr. Birkin.

Ist Form

(He eventually was stunned and fell off the bridge you were on)

2nd Form

(He began bleeding badly and fell down and didn't move)

3rd Form

(Bleed was coming out rather badly and he left)

4th Form

(He fell down and began mutating into his next form)

5th Form

(Blood began to shoot wildly from the top of his head and he fell down)

6th Form

(Blood was coming out and his body began to.....soften? Anyway, it began to soften into a less solid mass and it solidified after it had slid for a foot or two. Then, he somehow kept coming until the train detonated and not only blew Birkin's body up, but buried it under the wreckage)

There you have it.