I agree with that mentioned it briefly last year. OOTA's are classed as instant out as it can by unsafe to effectively "battle" in the exclusion zones of the arena, massively so for heavyweight events.
That being said, although you shouldn't be allowed to attempt to get back in the arena, the 10 second countdown should still take place to make the above scenario's fair. And if your bounced off the screen and back in the arena you should still be allowed to fight as you weren't immobile at any time.