The reason I made this thread is because I feel Vermaelen gets a lot of criticism whilst Koscielny largely gets away with little when he's responsible for quite a few key mistakes which cause goals.
The challenge for me was more than rash, I simply can't understand how anyone could think they'd get away with putting their arms round someone and holding onto them, rash would be a pull, a nudge but that wasn't rash for me it was very poor.
Dzeko turned him, once that had happened there's nothing you can do without giving away a penalty and perhaps getting yourself sent off.
IMO Koscielny has been prone to errors for his whole time here and at this stage of his career and at his age he should now have cut these out, I believe this is a trait of his game that won't disappear. That's not excusing Vermaelen, because he's been very poor as well.