That is the “low tech”; works 100% of the time; will make your live easier in the future solution.

It takes longer than remounting but getting rid of a NTFS drive in a Linux only environment is a good move.

Since no arena is specified I assume it to be the only logical place.

In space! (the winner is brought back to their natural habitat)

Everything else would be unfair to at least one of the parties.

I think the ants would outlast all the animals and insects. They might freeze solid and (some) might survive the unfreezing after the figh. Or they could form a giant ball where the ones in the middle survive. And who cares if 19kg die.

On the other hand, the oak would probalby last weeks and could sprout new leaves and roots again if given proper treatment back on earth.

So … GO TREE!