Closer to the building, Kelsier began to Pull instead of Push — he switched from burning steel to burning iron, then yanked on a blue line leading to a steel window frame. That meant he was Pulled upward, as if he were on a tether. It was tricky;  the  ground  still  tugged  him  downward,  and  he  also  still  had  momentum  forward, so when he Pulled he had to be careful not to slam himself into things.