The first time you see Mike (Vlad's friend), he will be helpful. Much later, you will have to fight him. To avoid that fight against Mike, let him take care of every mobster in Ragnarok. He should get killed. If this does not happen, after the final Mob fight, kill him just after the intermission sequence that presents the names of Vlad and Vincent. You should be able to take care of three to four enemies without his help.
