If you were a member of the team which of the following would be appropriate to suggest?

Suggest to the rest of the team that they call a meeting with Jack to find out if he is okay and to advise him of their concerns about his behavior

Involve the team's manager from corporate offices.

Suggest to the team that we should wait another week to see if Jack's behavior has changed

Ask Mike if he could have a private meeting with Jack to find ut what is going on

Nothing $-$ this will blow over, everyone has a bad day now and again.