You decide to hide. Finding a big rock, you quickly duck behind it.
You hear a growling noise. Looking behind you in horror, you see an alien.
You quickly jump to another rock. The alien doesn't see you. After five seconds, the alien looks at you.
You found a weakness! The alien has bad eyesight! The alien starts bounding towards you. Uh oh, it's fast! you think.
What should you do? You can see a row of rocks receding far into the distance. Should you duck behind them, or fight?