Thank you for those.

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If he still doesn't respond ^{[as a whole]} in a few days, then I'd suggest "creating a flag ^{[type 2 or 3]}" on his profile and posting it here so with enough support ^[+3], it'll become active and he'll get a "red banner" on top of his threads + this "warning" on his profile.

Note:

• Type 2 flag ^{[second option]} lasts for 3 years while the type 3 flag ^{[third option]}, lasts for 10 years ^{[regardless of its length, only choose the one that's appropriate for your case]}.
  ^{- I'll be tagging him as well.}