Jan was able to extract justice once I brought it up to her. It seems that this was not jain's first grief; Jan jailed him before because of it. Because this is not his first grief, I suggested the fine stated above ($150), as well as another jailing.
Jan explained that this is jain's last chance. Jain's last griefing escapade was much more than the few blocks he broke this time. He, therefore, should be on his last chance.
Final verdict (as Jan has already carried it out):
Jaxon: $150 fine and a firm warning
Jain: $150 fine and jailing until he repents to a staff member.
Thanks, Jan, for dealing with this in a reasonable amount of time. Since it has been dealt with, I will now lock this thread.