Shinichi could have given her a good shove to make her fall down the stairs, but nope. Panty pulling obviously the superior move !
Speaking of panties, at some point between the spread in p10 and p11 her briefs get annihilated. I'm sure there is a valid in-story reason for that, and it's not just hiramoto deciding to forget about them in order to give the readers a good view…
Also, I'm sure the old lady spy holding the "dog" could be of help. Although there's no way two highschoolers could afford her rates. Is Ichigo on good enough terms with her to ask for a friend discount ?