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There are two windows you can still get up.1 behind the pig in the claymore room and 1 bottom left of stairs when you open first barrier outside the first elevator..
Get two people on each window...The scientists will run to 1 of these windows..
The other two jump off and go to the window where the scientists is...
He will be standing there looking at the other 2 on top of the window..
Then Kill him at your leisure ....You get trophy as well ...Not sure if you all get it or just the guy that kills him..Take turns at killing him if only 1 person gets it..
My bad if posted already...I did search it first.
+REP or thank ir i helped