Nah, teams aren't even allowed to talk to RFA's until June 30th. And can't sign an offer sheet until July 1st.
Boston must have really been at odds with Hamilton over a new contract.
They can talk to them after QOs go out. There was an offer sheet.
edit: this year it's the 30th. Anyways, they can just say they intend to sheet him. Sweeney blinked.