Crash Bandicoot 2 N. Sane Trilogy : Gameplay #21 (Road To Ruin) - All Gems (Purple/White x2) 

8:53 No, no, no, Crash! To save the world, I need crystals. Crystals! One more time. They look like this. Crystals, Crash! Go back through one of those doors and bring me crystals!

1:01, you have to use the sliding combo to kill him

5:25 - 5:35 No, no, no, Crash. I said bring me the crystals! Now, get back in there.