It would be easier on their whole guild to take care of him quietly and claim his entire team was wiped in the tower. Heck just tell Alina about the threat and she'll take him out herself.
That opening image making their shadows look like they are dancing together and this entire fight scene was just fire. Best manga chapter that I've seen in a long, long time.
I 100% back all three of those assertions. However, I've read enough manga to know that Japanese food can make you immortal and bring world peace. Also that wars and genocide would be committed to find rice.