The "Knockout Game" was all the rage on Blue Bloods Season 4 Episode 17 and it lead to a six months pregnant woman losing her baby. 

I kept wondering if this case was going to decide whether the assault would also be considered murder because of the unborn child but it never got that far. 

Watch Blue Bloods Season 4 Episode 17 Online

Danny throwing Willy Hayward in his trunk and performing his own version of a lie detector test made me laugh, especially when he yelled out "squirrel" and swerved. Danny always has had his own way of doing things. 

I was surprised that Mike hadn't brought his own gun when he went to confront Moses. I really believed that if he took the time to track down the man who ended the life of his unborn child that it would be to kill him. Going there simply to make some punk, drug dealer understand what he did to his family felt completely unrealistic. 

Back at One Police Plaza, Frank was having an ethical dilemma and after last week's conversation with Jamie, I wondered if he was the one up for promotion. Instead, it turned out to be the son of a drinking buddy of Henry's.

Frank refused to promote Timothy because of that relationship but was that just as wrong as holding him back if he were actually qualified?

As much as I disliked Henry's way of handling things, I appreciated Garrett's comments to Frank in this Blue Bloods quote…

At some point in your life you went up the mountain and you came back down with your own tablets of what is and what is not the right thing to do written in stone, which allows for certainty but not always wisdom.

Garrett

• Permalink: At some point in your life you went up the mountain and you came back down with your own...

Garrett's ability to to tell Frank when he's wrong is one of his greatest assets and something that makes their relationship so enjoyable to watch.

I also appreciated that Frank was willing to re-evaluate his own assessment and come to a different conclusion.

The only one I was truly disappointed in was Erin. 

Jack certainly wasn't the person I expected to see in her shower but I kind of liked that they were having a fling. It looked as though they were having fun and I didn't see anything wrong with that. 

It felt like Jack wanted to take it to the next level, meaning openly dating instead of sneaking around. When Erin appeared to agree the man was obviously over the moon. He really cares about his ex and things seemed to be going well.

And then Erin pulled the rug out from under him. Instead of dating she wanted him to move in. It was a set up to push him away. She said that they'd already been married and accused Jack of only wanting the fun of dating instead of the responsibility of a serious relationship.

The way she dumped him after their dinner together simply felt mean. Would dating really be so bad? They've been divorced for years. Nicky's about to leave for college. What would be so wrong about the two of them getting to know one another again and having some fun in the process? 

And even if Erin felt differently, she didn't have to blindside the guy to make her point. 

Now it's your turn, TV Fanatics. Was Erin wrong to break up with her ex the way she did?

C. Orlando was a TV Fanatic Staff Writer. Follow her on Twitter.