Why does Ashe+Runaan w/ Ranger's Focus hit more than 3 targets?

It's a special exception made specifically for Ashe in her role as a team fighting utility carry.

A: Ashe is popular and makes money.

B: Ashe is a popular LC$ pick.

C: Riot is run by greedy fucks, who intentionally break the game to make money.

Through a combination of all those, we have lots of bugs that Riot ignores or touts as "features" in order to milk money off of gullible whales. Ashe being a good example. Riven's animation cancels are another good example; they are a bug on LITERALLY any other champ, and are immediately fixed (and the champ is often disabled while they're being fixed too), but Riven makes money so we act like it's fine for her to have them.

More than 3 targets? Where did you see that?

Wow, I thought this was complete BS, but it actually happens. However, it was in a training session, so we would have to see about an actual game.