The Aftermath thread is from a post that you made this month, which means that you would need to submit it as a post rather than an individual thread. To pass activity check, you would therefore need to submit your post plus 8 additional comments in 2 or 3 threads where you tagged someone else's post. The alternative would be to submit a total of 15 comments in 3 or 4 threads where you tagged someone else's post, but it doesn't look as though you're able to do that.

Unless you have any other activity to submit, JC will take a strike for this month.