Standing on the right side of the wood behind B-site, throw the smoke using the window covered by the chimney as guidance. Aim at the top left of the window. Left click throw.

Lands in a strange way but there won't be any gaps.

This smoke and this flash (https://www.csgonades.com/nades/wJtM7KHj8io8WKQDlqPX) can both be thrown from the same place.