I recently met 1:1 with a business mentor and potential investor whom I've met with twice previously at length and am increasingly friendly with. The previous times he's been mild-mannered, relaxed and deliberate. This time he was speaking rapidly, often not making sense, jittery and distracted.
I'm not an expert but it was so deviant from not just his typical behaviour but any behaviour I've seen before I couldn't help but interpret it as some form of (hypo)mania.
I'm wondering whether I should have said anything or should acknowledge it next time I see him? I took the meeting slowly and tried to calm him down while humouring the more outlandish stuff he was occasionally saying.
He's a married ~40 y/o man and I believe the predominant causes of (hypo)mania (bipolar, schizoaffective disorder, etc) very rarely come on around this age, so I feel it's unlikely he's unaware of it. But in case he is unaware, or maybe just to put him at ease and let him know it's fine and it's not going to affect our personal or professional relationship, perhaps I should gently acknowledge my experience of his behaviour next time I see him? i.e. mention that I found he spoke very rapidly last time and ask if all was okay?