This question is covered in the FAQ.
https://munchkin.game/gameplay/faq/
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Q. Some cards say they automatically kill a certain type of Monster (like the Potion of Halitosis and the Floating Nose, or the Churninator and Level 1 monsters). Can anyone interfere with this? Can anyone play a Wandering Monster?
A. As of July 2018, removing the final monster from a combat ends the combat immediately.
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And again to iterate that other players can't play cards if the last monster is auto killed.
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Q. I used an ability to automatically kill a monster. Another player used Wandering Monster to add a monster to the fight, and then played Transferral Potion to move the monster to himself. He beat it. Who gets the level and Treasures for the monster I killed?
A. As of July 2018, if you automatically killed the only monster, combat ended and this whole sequence can't happen.
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