Cutting into a thigh or calf is really bad idea.

There are large arteries in there that a chain saw can get to darn near instantly.

Cut a femoral in your thigh and you may bleed out in a matter of minutes.
As in fast enough YOU may not be able to get a tourniquet on YOURSELF.
Maybe if you had it on loose and just had to pull it tight.

Get some way over rated chain and pull them out going forward off a rear attachment.
Like 30,000 pound proof chain.

You can get rolling forward and let the momentum of the vehicle do most of the work.