Brought to you and inspired by Gungrave: Overdose.
Slam two SMGs into his chest and empty both clips into him, throw them down,spin around and do the same with a shotgun. Then jump back, pull out two swords, make five copies of myself and run around him, slashing from six different directions. All of that blood will have inexplicably remained unmoved until I make the final slash, the damage from every shot and the slashes all taking effect at one time and ending him in a spray of gore.
(This is inspired by a combination of Beyond the Grave's finishing cinematic against Fangoram and Juuji Kabane's finishing cinematic against his former partner Kugashira Bunji. I'll look them up and post them if anybody actually cares and requests it.)