B doors inside smoke from upper tunnels

This utility is used for a delayed B site execution. After waiting for CT utility to fade, it provides a B doors smoke to cover teammates and prevent them from getting picked off by a player holding from back site.

It's important to note that this is an inside B doors smoke. While it has a high margin for error, it can be easily countered by a CT one-way smoke. A safer alternative is the outside B doors smoke.