No idea if it was suggested here before but I'll go for it:

The event is called The Hunger Games. (Yes, the survivor event but with some modifications).

Instead of being on a random map like...

Event suggestion: "Pick-a-boom"
Map: Any

The player will look back ( He may no look at the ET while he's laying the landmines )

The ET will lay three or four 1-Hit K.O Landmines and one that...