both lungs will fill fill up with blood if only one is hit. This usually only happens though on step angled hits, where I find the broadhead will actually slice a huge hole in a lung or even slice it in half! lights out!

A liver shot is also very deadly, most of the deer ive bow killed did not run too far, before stopping and looking behind them, as if to say what was that? Many Xs they laid down or just stood there with blood pouring out their side, 40yds from where they wre hit, ive even had liver shot deer continue to feed and keel over dead minutes later. The trick is to give them plenty of time before getting down and going after them.