Graceful Exit is the proper way to “cancel” a node: here’s a link to the page for that
Then if a node goes offline, it would not impact the reputation or viability of the other node. They are independent of each other from that aspect.
Then as deathless states below, the ingress traffic that the two nodes are splitting 50/50 right now since they are behind the same IP, would all go towards the node that remains.