Thomas Hewitt was born in a slaughter house in rural Texas in 1939 he had a facial disease that ate away most of his face and nose.. he was self conscious of this and wore a mask covering the problem area : around his mouth and nose. But after the slaughter house went out of business in 1969 and he made his first human kill. he began to take the facial skin of his victims. sewing them together and wearing them. (Spoilers) After Travis county went under his family had to find the means to survive, they adapted to cannibalism and carried on life as normal. Thomas has been scared by his cannibalistic hunting practices, When Erin
(the victim he was hunting) started fighting back and cut his left arm off with a meat cleaver .
This would most likely make it difficult for him to operate a chainsaw, when most people have a hard time using chainsaws with both arms.