Back foot snated beaver

I have caught beaver on snare poles by front foot,back foot toes tail,teeth and nose.
All under water sets where beaver is swimming.
Any time I have snared beaver on land all were either by the neck or behind one or both front legs.
Not a fan of live snaring beaver and I use it as a last resort for certain stubborn nuisance beaver.
Would never live snare a fur beaver.
If that snare was set where beaver was walking,the snare may have not been stabilized adequaely at the lock,and may have been knocked down by another beaver previously or by the caught beaver.
If snare was set where beaver was swimming an extremity catch is not too uncommon.

I once set a foothold on an 8ft drowner cable
cought a beaver but it didn't go down the cable
when I pulled the set up the trap was at the end of the cable
the beaver had its hind foot twisted in the cable near the top stake
weird stuff happens

I imagine he stepped his back foot in the snare or almost made all the way through the snare. I have had some weird experiences with snares.

Probably a castor mound, and the beaver came in head high/ aggressive, head above the loop, knocked the snare down and got caught by the same rear foot as the snare support was located, left or right side of support. Happens more often when the beaver is swimming than on land, but both are possible.
The beaver may also have been carrying mud in its front feet, walking on its rear feet, to cover your lure with, knocked the snare down and got caught by the rear foot on either the approach or exit.
You can simulate these scenarios pretty easy. Set a snare with your usual beaver height/ diameter loop. Then push on the top of the snare while moving forward, to simulate the beavers body contacting the snare rather than their head /body entering the loop. If your snare is loaded, it will close partially until the loop hits the ground, and will remain there partially open, and instead of centered in the trail will be pushed more towards the side of the support wire/ support stick. If the snare is not loaded, the beaver has to physically pull it shut, and most often pulls the loop down quite small as it pushes forward, or catches on a front foot or snares support side rear foot. Either scenario can account for front or rear foot catches.