Alistair didn't realise that Evan was faking tieing his shoe laces. Although he did possess a large amount of intelligence concerning criminals and his powers of observation were more effective than most, but he wasn't as perfect as the great Sherlock Holmes.<br/>He decided to close in on Evan and use the chance to observe the package he carried more closely. If he could see the pacckage more clearly then maybe he would be able to confirm whether he was right to approach the stranger.<br/>He walked towards Evan, bringing out his bag of chips and helping himself to a few of them in an attempt to give the appearance of casually walking by.