trust in him ... look what he did to me

There were two friends who went down the mountain, they walk inside the mountain, one of them goes ahead and climbs, and a big rock falls on his leg, getting trapped.
The other friend tries to help him by removing the stone but can not, then decides that the only way to help him is to go and get help.
Then he is left alone and it starts to rain and he starts to raise the water where it was until he reaches the neck, but he never stopped trusting his friend who would help him.
When he almost gives up his friend arrives in heli-boot and rescues him.