Since the german forum is pretty much dead and we never get a reply from the mods i‘ll post it in here.
The description in the picture is in german but the mods/devs should know what the slumber node does. It states that the defender is stunned for 15 seconds and gets powerlocked for that amount of time. I don‘t know a way war machine can shrug off debuffs so what‘s up with that?
The node was 105 in map 7
