Who's Erik? I don't remember. Is he Lucy's boss that tries to fuck Liz? if he is, that's kind of dumb that you have to spare him to save Lucy and her daughter later on
The fact that you don't remember who I'm talking about is a good reason to think it's dumb. Yes, that's who it is. If you spare him, you force him to pay the medical bills for Lucy's daughter, which allows for proper treatment of her Tay Sachs Disease. This, in turn, allows her body to be strong enough to survive.