1- Not saying player is hacking, most probably he spent time finding the better build to make other team spend time (or is a hack, have no idea, I dont play thief as you know).
2 -And no! I cant open a ticket cos you know your support system only say to report or open tickets about verbal abuse.
3 - And most probably this is a viable build (have no idea and dont care)
Dont mind my gameplay because I was just trying to track this user [Xiao Venom].