A palpable sense of relief came over passengers on the westbound D-line bus Monday when someone else struck up a conversation with 53-year-old cerebral-palsy sufferer Sharon Bellacosa. 'Boy, that was a close one,' said rider Jon Neidhardt, 28, who was sitting next to Bellacosa. 'For a second there, I was terrified she'd ask me if I knew how much farther her stop was in that slow, slurred voice and then try to segue it into a friendly chat with me. Luckily, the guy sitting across from her was willing to sacrifice himself for the good of the rest of us and talk to her.' Neidhardt said that, despite not having to talk to the disabled woman, he became tense while listening to her loud conversation and did not relax fully until she got off the bus. 