Let me see if I understand.
A group of people go to rob a safe that contains already stolen money. To get past the bad guys they use a substance to give them the runs (diarrhoea). Do the roses contain this substance or are they used in some other way to contribute to the overall need for the toilet? Oh dear, the last bad guy (?) gets locked in the cellar.
Are the bad guys locked in the cellar with the good guys and there isn't much air left and one guy keeps farting/pooping his pants? I did see a video recently with a scene like that. Cannot remember exactly where though.