어서 넘어가다

move on; cross over

A "-아서/-어서" clause (do this, and then) feeding 넘어가다, which is both "go over/across" and "move on to the next thing". Both are here: crowds gathering and crossing over, jumping across, shooting enough to get past it, easing across into the middle section. Several lines are a host moving on — there's nothing to read but laughter, so we'll skip ahead; it's 11:10, so let's move on. A related use is letting something slide, which is what the 1815 line does.