Woma owners-- Advice ?? (the real Woma, not BP morph hah)

I have a nice young Woma I picked up from a breeder in Jan. He's doing quite nicely, and is about 20-24" long. He's a good eater on hoppers now.

When I feed him I've noticed that he seizes the prey (prekilled by me) with his mouth and doesn't bother to constrict. Now if I pull the tail a bit, he forms a coil and will constrict.

My concern is I gave him a hopper, that wasn't quite dead by accident, he did the above, and if I hadn't noticed would have swallowed it alive.

I never observed this my with ball python or Hog Island boa, they always constricted when they were as young.

Is there something different about this species, that they don't necessarily constrict that much? How concerned should I be that my snake may eat a live mouse? I'd like to think a mouse can't chew from the outside that it would die by then, but who knows?

I just can't figure out why he's reluctant to constrict. I've read they hunt in burrows in Australia perhaps they don't have room to do that.

Any ideas ?