Dead Trigger 2: How to easily kill Kamikaze, Vomitron and Scienfist

WP – "Dead Trigger 2 pits you against massive hordes of zombies, and while most of them are fairly easy kills, the minibosses can be an absolute pain. There's nothing worse than being right at the end of a stage and having Kamikaze kill you in one single hit, or Scienfist's radiation rapidly deteriorating your health, or having Vomitron blind you before being killed by zombies that you can't see. Killing them gives nice bonuses, though, such as large quantities of cash, or new blueprint parts."