The filthy and grizzled old man eyed each of the passersby warily. They all seemed busy, preoccupied. Rushing by, pretending to be late for work or school. But he knew they were watching him. Without a moment's notice any one of them could turn and attack.
That young mother pushing a stroller? She had walked past him three times this week. Each time she pretended not to notice him, but he knew she was keeping track of his every move.
The young lad posing as a paper boy? He was too keen-eyed and tried too hard to avoid looking at the man in his eyes. It was a dead giveaway that he was paying too close attention.