It's not like Goyle and I maintained our friendship after the Battle of Hogwarts. Unlike me, he actively and voluntarily chose the Dark Side and followed in his father's footsteps by fighting for the Dark Lord out of conviction. Still, it's pretty unfortunate that firstly he's here at all and secondly I'm the one who has to deal with him because I won't be able to kill him. In order to cast an Avada on a childhood friend, I would definitely need to reactivate my Occlumency, and I want to avoid that at all costs. However, he's also not a good candidate for the Exit and therefore not predestined for capture, because if Goyle is anything, then a loyal Death Eater.