There’s a point in just about every epic tale when our hero is beat up, bloodied, everything looks lost, and they’re down bad all around. The triumph of evil seems inevitable and going on seems like a Herculean task. Then, just when all hope looks gone, the mentor/sensei/wise old man that taught ‘em everything they know from Day 1 pops in to drop some knowledge that usually goes something like...
“Listen up, crotch-stain. Remember your training, and trust your instincts. You can do it! I believe in you! Bye-bye!”
....or, you know, something along those lines.