If Murray hesitated, that's well within his rights and I'd say pretty normal when a ball lands on the line or close to it. If it affected Fed's concentration, I don't think it's because Murray deliberately tried to throw him off.
Murray had it right. Fed fired himself up with that moment and raised his game. They can take it as big boys. I just wish Murray was more gentlemanly at the handshake but that's a minor thing.
End of the day, storm in a teacup as the Brits like to say.