What did he mean by freeing Til’s son?

‘Did those guys kidnap Til’s son to tie him down too?’ If that was the case, Nick could understand why there was an internal conflict between Til and the leader of the robed figures and why the leader was now making such a strange offer to Til.

‘If it’s those guys, it’s possible,’ Nick thought. After all, those guys immediately extended their hands to Til after he failed to kidnap Walter and Ellie. Nick thought he was now able to grasp how their relationship operated. Yet, the leader’s following words crumbled all of Nick’s interpretations. 

“I have a good guess on where Nick placed your son. You have no more reason to be blackmailed by him.”

“What nonsense are you saying!” Nick burst out what he barely managed to hold in the last time the leader spoke. He couldn’t help it this time as he shouted, “You guys are the one who used Til to kidnap my daughter and blackmailed me!” If that wasn’t the case, Nick would have no reason to bring a whole bunch of subordinates that he had no trust in and cause a commotion like this in the middle of the...