(ok, u were supposed to be walking on the other side. lets say Victor crossed the road)
Victor crossed the empty alley as his destination, Silver snake was on the other side. This was when the girl, whom he hadn't given a second glance bumped into him. He swore loudly looking at the girl as she apologized and walked away.
Victor continued his walk, opposite to the girl's direction. This was when he noticed a hag, probably with a stolen wand walking towards him but had aimed his wand for the girl. He was an elderly hag, but looked strong and dark.
The hag did the jelly legs jinx towards the innocent girl who probably wouldn't notice as she was facing his back on them. Victor turned around, his wand already on his hand to see if the jinx had victimized the girl.