One of the central themes of hunterxhunter is the value of experience.
In chapter 405, dogman reveals his ability is to detect the strength and type of nearby nen users. This is a fucking stupid ability.
But.
It's deeply evocative of his design and name. He's a loyal guardog to an insane murderous fascist, with no understanding or interest in understanding the abject cruelty and stupidity of his and his faction's actions.
For anyone who cares, (no one) I will be updating the infographic soon with all of the levels.
ANYWAY his abilty reflects his, like most of his compatriots, lack of understanding of nen. He doesn't understand that you can, through experience, clever thinking, and team work, identify and isolate nen users (we've seen Furykov and THE SPIDERS do it before). It does however solve the problem immidiately in front of Dogman. They need to be certain that the kidnap ability will work. In orded fo ensure this, the target must not be a nen user. This target will presumibly be one of the princes, or one of their inner circle.
I immediately think of an earlier chapter where, after Morena's group fails to kill Hinrigh, they yelled out for "Someone who can beat conjured birds" or something similar. This indicates their complete lack of understanding. They don't understand hinrigh's ability, they don't understand nen, and they don't understand the goals of nen combat.
The kidnappers ability only working on someone unaware of nen is also deeply evocative and very character revealing; his ability only works on the defenseless.
Cool chapter, fuck I love this arc so much. It has everything I love about hxh other than it's main characters.