Yelling runner - sneak and steal

A game of running and shouting. A traveller goes into big dark hall, and need to collect stones. (wHY? i dont know). There are lizard-like creatures behind all stones, which disturb traveller. Initially, creature is afraid of traveller and hides behind stone. But when one creature touch another, then its courage increases, and it starts to chase traveller. Traveller can shout once every 5 second. Creatures are afraid of shout and run away from traveller for a while. Game can be also found at git...