Distance
Havoc ignored Mustang as soon as he entered the office. Mustang was obviously surprised and hurt. Havoc supposed that he had thought that last night was a joke. But Havoc had been deadly serious. He wasn't willing to jeopardize Mustang's career for such a stupid thing.
Mustang's mask settled firmly into place, his features hardening into indifference. Which was just how it should be. Havoc admitted somewhere inside that it hurt, but it was better this way. He wouldn't risk Mustang getting blackmailed because of a stupid choice on Havoc's part.
But damn, it still hurt.