most tournaments, freerolls included seem to have "stages" where donkey play becomes most rampant right at the beginning because people are trying to get ahead then it dies down in the second hour for abit, then either after third break OR near to bubble (between 10-50 people depending on tourney size) play will get very aggressive because large stacks will pick on small stacks to get them out then once bubbles hit play will die down until near FT then once on ft play can go either way