Violence?
Pierrot eyed Luca and decided that Corso shouldn't be able to be that bad. However, there was Sleepydog. That man… he never left any bodies in any scene of his assassination. Many a time, he would only bring necessary parts to identify targets… normally eyes.
If someone like that would be involved, Pierrot knew that Luca was serious when they said they would resort to violence, and oh, Sleepydog would love that, wouldn't he?
Pierrot then waved his hand as if saying 'no, no, no', but he was starting to fret. It was true that he didn't make a deal because he was scared… and because Legend made a stand firm against it. He felt like he would be abandoning Legend if he sighed up for it like Craig did.
Moreover, he didn't want Craig to die while he was only there, doing nothing.