Generally I thought this episode was awful and cringe-inducing but UM SAM WINCHESTER PAINTING DEVIL'S TRAPS IN YOUR OWN FREAKING BLOOD. BLOOD WHICH YOU HAD TO PRODUCE BY SEEMINGLY GNAWING ON YOURSELF BECAUSE YOUR TEETH WERE YOUR ONLY DAMN WEAPONS. YOU BETTER BELIEVE I LOVED THAT SHIT. AMAZING. I THINK SAM SHOULD CHEW ON HIMSELF AND THEN OUTSMART MONSTERS WITH HIS BLOOD MORE OFTEN.
(AND I MEAN SRSLY. YOU HAVE TO RLY GO AT YOURSELF TO PRODUCE ANY AMOUNT OF BLOOD LET ALONE THAT AMOUNT OF BLOOD. THAT WAS SO MUCH BLOOD IT WAS DRIPPING! LIKE THE MORE I THINK ABOUT IT THE LESS SENSE IT MAKES, BUT I WILL GLADLY HANDWAVE THIS BULLSHIT AWAY.)
Also threatening to kill Castiel like a lunatic. Why? Because he is a lunatic.
So those bits I approved of. The rest can go to hell and stay there.