Even Holmes must realise that is not how gravity works

[tiger_moran]

"We tottered together upon the brink of the fall. I have some knowledge, however, of baritsu, or the Japanese system of wrestling, which has more than once been very useful to me. I slipped through his grip, and he with a horrible scream kicked madly for a few seconds and clawed the air with both his hands. But for all his efforts he could not get his balance, and over he went."

According to this Moriarty literally hangs in the air for several seconds with his feet either not touching the ground or barely touching the ground and his hands touching nothing before he finally falls. This is the Victorian equivalent of a fucking Wile E Coyote and Roadrunner cartoon.
Once again: