I had that one lady who name starts with an A pop up and join me during some midnight demon slaying. Of course she showed up after everything was dead and I was going back to the car but its the thought that counts, right? It threw me off at first because I thought she was a group of MTs.
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I just used a summon on the Necromancers. I also equipped the ring that prevents instant death. Could have done it without the summon with the ring on but I got tired of the bad camera angle (the were in a small circle and refused to come out of it).
Still haven't killed the tiger/cat things. Have you beat the game yet because there is an item you get that works on other hunts that might work on them as well. Can't say that I've tested on that particular group though. The item definitely makes cleaning up low level hunts a breeze though.