as she came to a halt , it theory ( and practice , after practice ) topsy would then come forward with a set of chocks , place them either side of the nose wheel , and then come and take the pills from her out-stretched hand , but in this practice he had just come off the phone with fred , and he snatched the pills out of her hand , and smiled sweetly at her - then natasha noticed the chocks , in a flower bed , and dingbat started to trundle slowly back down the incline .