I was torn on how I felt about Damon's reaction. On the one hand I loved that he cared so much and was trying to put a stop to it, but on the other... DUDE, you're the one that did this to him. I feel like it was some kind of flaw in the writing or Damon's just a rollercoaster of emotion. I mean, the end of 1.17, Damon looks horrified that Stefan is drinking. End of 1.18, Damon purposely leaves blood to make Stefan drink. Beginning of 1.19, Damon thinks it's a terrible idea for Stefan to be drinking and knows he will get out of control. WHUUUUUUUT?