I can imagine the tiny wendigo outrunning a human, for sure, but I’m not sure if their strength would be enough to be able to take down a full grown person. They can only be so strong, after all, and the average grip strength of a human male is around 60 to 110 pounds of force.
If the canon bros found a tiny wendigo raising hell, they could keep it in a mason jar. It can’t exactly kill a human, so they might as well see what it can do. Dean sneaking it bacon and Sam snipping that bacon isn’t going to do it any good.
It would also be a funny story if a little wendigo got free in a house, everyone climbing their chairs while it tries to tear through everything but just can’t do much at a twentieth of its size.