Yes, he is very frustrated with the damaged girl's attempts to make herself feel better - she is a mind coming undone, but with a focus similar to his, she could make it through. I am glad that by the end of the episode Dexter agreed to help her out, conceivable preventing himself from getting into more danger because of the trouble she has been causing, but also because it gives him a mission. He cannot save Rita, or avenge her. Her killer is already dead, and at his own hands although he did not know it at the time. But perhaps killing someone specifically to help another individual will accomplish what he needs.
Meanwhile, Masuka (C.S. Lee) has been killing me. Watching him describe the crazy sex antics which led to the deaths of two people Dexter actually killed was almost as funny as when we got to see his dragon tattoo an episode or two back. I laughed for the entire scene and had to rewind and watch it a second time so that I could find out what was actually going on in it.
Finally, I was actually happy with the Angel (David Zayas)/Maria (Lauren Velez) developments. Bringing in a lady who might lead to the capture of two serial murders is definitely a step up from a puppy. Not only is Angel finally redeeming himself before his wife, he is also reminding us that he is a capable cop. I'd almost forgotten that. Plus, Quinn (Desmond Harrington) and Deb (Jennifer Carpenter) are a couple!!! When Deb asked him to tell her that the relationship wouldn't end badly...well what relationship of Deb's ever has. I suppose when she broke up with Anton, that wasn't so bad, but she clearly didn't have deep and true feelings for him. I just hope that Quinn doesn't break her heart because he is convinced Dexter isn't the stand up guy everyone else believes he is. It's probably a really good thing that Doakes and Quinn were never at the precinct together, or else Dexter would have had a really hard time of things.
Can't wait to see the second half of the season.