I wanted to get your opinion on something that happened today at work.
I'm a manager in a tech company. Since friday, we have this "defcon 3" situation at work, meaning that we have some production problems that need to be solved. But it's not so critical / urgent and basically 95% of tech workers in the company continue to work as usual. People can be asked to join the work to troubleshoot the issue but usually it's not really mandatory unless you are the only person knowing technology X related to the issue.
Today I'm doing a 1-1 meeting with one of my reports in the corner of the open-space, and some manager comes in. Without asking about interrupting, saying hello etc, he just says quite aggressively "you find me some people to work for the DEFCON 3". I'm like, what, and I tell him that they'll join the work on it if they want to work on it. He replies that since it's DEFCON3 it's mandatory that some people work on it. I tell him OK, I'm in the middle of my 1-1 meeting, we'll discuss this later. Then he refuses to leave telling me that DEFCON3 "trumps" 1-1 meeting and it's more important, visibly quite annoyed/agitated. After telling him several times that I'll finish my 1-1 and that I'll see afterwards, he leaves but quite angrily.
Afterwards, I was at lunch with other coworkers, around 10 or so. The same manager comes in front of the tables, and starts shouting angrily "When I ask for people for DEFCON3, I ask for people for DEFCON3! It's not optional to come and help". People were quite surprised / annoyed at this behavior especially during lunch pause.
This manager isn't even in my reporting line, nor is he "officially" the person that even manages this DEFCON3 thing, so I don't even think he has any authority to request people to work with him for no real reason.
What do you think I should do in this situation? I find it very "humiliating" to be disrespected like this, especially in front of my report. I think I was able to keep cool but otherwise given how angry/agitated he was, this would have turned into a full-on shouting match in the office.
Should I try to talk to him privately? To my manager? To his manager?