The problem here is how your screenshot doesn't show him going around and killing other players during blind time.
Now, why is it a problem to post screenshot instead of short video showing of person hacking - imagine if everyone would come and say some name for person hacking, many would end up being banned for fake accusing and we don't want a situation like that. I did said up once that for reporting someone you will need a video (like 30 sec duration or less, but enough to show a hacker and what is he doing).
Since he is level 30, means he is around for some time so perhaps maybe you can catch him again and racord what is he doing. In case you are not sure how to do recording, just download Bandicam (it's free), record and upload a video on Drive or Youtube and you can post it here or send me in private message.