If a stranger approaches with malicious intent, whom looks bigger or stronger, you do what you can to save your @ss.
A) Run if possible.
B) Get mideval, then run.
C) Kamikaze - i'm goin down and your going with me.
If you are outnumbered, you can still land good solid shots while outnumbered, even though you will likely get most of the beating.
Try sparring against 2 or 3 at the same time. Sure doesn't look like those aikido demonstrations