면 싸우다

if X, a fight starts

A conditional "-(으)면" plus 싸우다, "fight, argue". Most lines warn that a situation will end in an argument: go up there yourself and it might turn into a fight, so call security instead; they say friends fight when they travel abroad together; staff who bicker the moment they get a chance. Two lines are the confrontational reading — 이러면 싸우자는 거고 and 이쯤 되면 싸우자는 거 아닌가, both meaning "that's asking for a fight". 싸우다 here is arguing, not physical combat. One example line is printed twice with two different translations.