Reptile players love to punish and rushdown, with oki's to stop wake ups, this makes things really hard for Ermac and Quan Chi especially because once he's rushed down it's hard for him to get them off, definitely try to bait out dashes make him aggressive and slam or push, or trance them as a punish, preferably push because it's quicker. This is probably more of a question for the Ermac and Quan Chi threads, I understand your reasoning for posting here, but people who know the characters you play more in depth could probably answer your questions better.