It would be the smart thing to do, if it weren't that they were talking about Mikey here. In which case, absolutely none of them would have even considered leaving. (Well, considered, possibly, but actually gone through with? Don could probably come up with some scenario where it might happen, but the likelihood was exceedingly poor.)

Don looks back down at the injury, frowning. "You said they were brains? That's the Kraang, and at least one thing your...universe has in common with ours. It was probably an inter-dimensional portal, if the similarities extend that far, except none of us - at least Raph and I - had even seen it yet. Do you remember anything of importance about it? What it looked like, what the control panel looked like?"

He wouldn't even think of asking this of his Mikey, but if this one was competent enough to try and maim people with household appliances, he could probably be counted on for some observational qualities.