OPM: What level durability feat is this?

I think this is just sealing, there's no durability feat required, more or less spatial/dimension manipulation

Yeah I don't think this is a durability feat either.

I think Blast tried to trap him into an endless loop or void or a dimension.

Is that feat even quantifiable?

That seemed like BFR to me.

Unquantifiable. Just seems like BFR.

That just BFR

Just BFR.Dura aint required

That's not some portal to another dimension, so how it is BFR?