It's unlikely to be tactic, in general. If it's in a normal working day (as against a specific hiring event), it's likely to be a minor failure of logistics. I

It's unlikely to be tactic, in general. If it's in a normal working day (as against a specific hiring event), it's likely to be a minor failure of logistics. In your case, it's probably not that. It's more likely that the second interviewer thought that it wasn't worth their time carrying on with the interview. For example, if their expectations of your experience/knowledge were way off reality. Very rude of them not to just say so if that is the case though.