[illegit]

Yeah, but even if we assume he is a good/tricky player who is capable of a resteal with air here, unless he's moving in literally every hand you can't give him a range of AA-72o. So you still can assign him a range, but add an increased probability of any 2. Like 80% of the time he has AA-77, AJs+, KQs, or whatever 20% of the time he has a random hand and go from there. Though this analysis is only productive if you have any kind of read. Against an unknown I assume this means a real hand of some sort 99% of the time.