[ And someone hears, someone who really should know better than to open doors without knowing who's on the other side but who's also too much of a goddamn hero not to. His grip on the baseball bat is tight and he only opens the door a sliver at first, ready to pull it shut again should the knocker be... less than human.
Of course, seeing that it's Rebecca makes Reid drop every defence he has. ]
Rebecca..! Oh my god, are you okay? [ Grip loosening and door opening proper. ]