Mantis sleep counters Jeff ult!

When Jeff is about to spit out, you can sleep him to cancel the ult and everyone pops out next to him. (They don't get thrown)

This works no matter who is being spit out, just as long as you sleep him as he's doing his spit animation.

The timing is tight, and you can't sleep him by reacting, since the delay between using the sleep and it hitting is enough for Jeff to go back into his swimming form. You need to predict it.

I've never seen anyone talk about this, even the compilations of what ults Mantis counters never mention it!