Actually buddy if a guy broke metagaming rule you can just pm him and tell him that what he did is wrong and he's breaking metagaming rule, as he said ic stuff in ooc chat, You can ofc explain the rule for him if he didn't know it and just verbal warn him and tell him to not do it again, Its not worth a warning and all that stuff ( In my opinion tho. )
and if you kept playing everyday until the next meeting your activity will be 2 weeks, which means it will be good!
Anyway good luck buddy!