One of the doctors at the vet clinic that I work at had a heart attack in April of this year. ?

He is on blood thinners since then. He returned to work right away and has been doing very well. He was working on a cow today and the cow got loose and stomped him real good. His leg was very bruised and he had bruises on his midsection as well. This happened about 1:00 this afternoon and now I rec'd a call saying he is in the emergency room. They can't seem to get the swelling in his leg down. I guess my question is how worried should I be. I really am concerned about him.