"Don't sound as fine as you could be. Must not be a very friendly visitor, huh?"
He's soon opening the secret door between the office and the corridor into the Hub. And the assessment doesn't take long. Ianto: hurt. John: here. Also hurt, but here and with Ianto hurt, doesn't take long to guess that there was a scuffle. While he has the vague thought that he shouldn't go doing this after how he last parted from John, the instinct kicks in first-- his gun's drawn and pointed at John before he can really think otherwise.