The voice that reached Sylas was clipped enough that he couldn't make out more than fragments, and even those pieces seemed to break apart before they properly formed. What did come through clearly was the Will behind them, and that alone carried enough intent that Sylas didn't need the exact words to understand what Slithering Madness wanted from him.
He wanted help.
Sylas had been to Hell once before when he went after Fanelei, but that didn't mean he had some open doorway waiting for him whenever he felt like returning. He had taken advantage of a very specific set of circumstances back then, and unless he suddenly decided to sabotage his own path on purpose, there was no reason to believe he could reproduce that route casually.
