PVP Overtime?

I randomly had the word “Overtime” appear with a purple skull during a PVP match. I’ve never had this happen before, Does this mean anything in particular?

That’s there to address the issue of two last biters going back and forth indefinitely, which is what I’m assuming happened to you. It poisons both monsters in order to hurry things along.

You learn something new every day. The weird thing is that my opponent had a last biter and I did not, I could see this overtime deciding the outcome of a battle here and there down the line if it’s triggered by the presence of a last bite monster

It does it when the game becomes a 1v1 after like 2 turns it poisons both of you