Break the law
Honestly, Quinn's mind was full wondering if he was doing the right thing or not at the moment. Not because he didn't want to help those in the Parasite group, but because he was worried about his friends back on the Cursed ship. They had been infected with the poison for a while now, and when Quinn had left Dennis was in serious trouble.
He knew his actions now would delay helping them.
The problem was, that with Sil his ability would only work for the next 24 hours. There was a chance travelling from the faction Shelters that they could run into beasts, Even when using his shadow travel there was the off chance this could happen. Upon returning, he felt that maybe by then Sil would no longer have his ability.
He might have been able to copy Pual's but he was even unsure if that would work, or if they were exactly the same type of ability as they differed slightly. According to Wevil, even when crazed there was still a couple of days before they would meet their end.