I agree with all stated. I will tumble for sure if I have a large enough gap and no one is at the other end hanging about! Maybe if there is one tucked in the corner and I have asked/warned them before hand.
I have been on the receiving end of a tick/splash or two and would hate to do that to anyone. Fine to do for a bit of fun (I am addicted now I can do it!!). But not necessary for training and worth destroying someone else'e experience or nose (worse case scenario)