Bill was wallowing in his sadness in the basement not knowing the dangerous being watching him from some dark corner of the room. A pair of glowing red eyes were hidden within the dark but Bill didn't notice as he was covering his face as he cried.
Pennywise took this as his chance. He appeared before Bill at a certain distance. He had restrictions as a demon after all. Only when his prey reached a certain fear value would he be able to touch him.
"Why are you crying, Bill? Did you miss Georgie?" asked the clown. His tone seems worried but when one saw his exaggerated expression no one would believe his worries as he was clearly acting.
Bill was shocked that someone like this clown had appeared before him. He is quite smart for his age and he listened to his parents' warning well. There is no way someone is able to enter the house and trespass it without his parents noticing.