|Winter blasting you.|
Martin Finnegan is an ice-based Houdini Splicer being held prisoner by Sander Cohen in a meat locker in Poseidon Plaza. He is one of three Splicers Cohen assigns Jack to kill and photograph to complete his "masterpiece" in Fort Frolic.
Finnegan apparently gained his strength from harvesting ADAM from the other splicers Cohen had thrown into the freezer to hold captive.
Like all Houdini Splicers Martin can teleport around, but instead of firing fireballs at you he fires bursts of ice. He is not difficult to kill so you should not be too worried.