Assuming they have some fancy type of visors, it sticks to that, so they can't see. If straight eyes, even worse. Likely burns a little, too. Fancy gadgetry weapons? Gets all up in that, gunks it up, renders it useless. Depending on dispersal, might even get on the floor, making it difficult for them to stand. So, you have a blind, unarmed opponent that is halfway falling over. Let ass whooping commence.