I have fallen on the T-side of a few instances of the good-ole' "pussy run". Disconnection at 2 seconds or so when the CT is obviously running away will avoid the loss of levels. However, from my experience as non-admin, this usually results in an admin slay for 'rejoining'. My humble suggestion is to advise admins against slaying in such scenarios in addition to the aforementioned punishment to the running player. Kind of a throwback to my personal anecdotes, but I still feel like a rejoin in such cases should not be treated as an exploit when the "T loses levels" exploit is precisely what is being avoided.