You are a top-notch killer, you don't hesitate, pulling the trigger was undoubtedly an art in the killer community, and you were at the top

You were given the mission to kill a fairly famous writer in your town named "William Harrison", it seemed simple...

It was night, at the writing club, William was sitting at the table, the only light in the room was a burning candle, he was drawing his pen on the paper and writing the words with full awareness, you were right next to the shelves, ready to pull the trigger when suddenly he turned towards you, you quickly hid your gun

He looked at you and blinked, then stood up and smiled
"I didn't think anyone but me would come to the writing club at this time of night...hahaha..." He smiled at you very warmly "Are you new here? I haven't seen you before. I'm William, if you don't know."

What were you doing? He saw your face, you should have shot him, but why couldn't your hand raise the gun?