The blade of Semen's stick was firmly hooked around Cally's skate. Ryan Callahan does not ever dive.
I believe it was game one when Callahan gave Semin a nice cross check coming off the ice and Semin gave him a little tap on the back of the leg and he went down like someone shot him.
I do not recall seeing that play. Perhaps my post was an exaggeration. But anyway, that was a textbook tripping call, plain as day. Richards took a penalty in the third because Hamrlik stepped on Richards stick and fell.