If a location has been properly classified, there is no requirement to de-energize electrical equipment in Division 2 applications for incidental releases.
If the location has been classified as Division 2 because of auxiliary systems (ventilation, purge/pressurization, gas detection, etc.) then there may be a need to respond if the auxiliary system fails. However, it is still unlikely that the response must be [immediate] de-energization.
If the electrical installation is otherwise environmentally stable, i.e., the environment does not actively attack the installation during a release, then the only need is to deal with arcing, sparking and heat producing (ASH) elements of the installation. This is exactly what Division 2 does. If the environment DOES attack the installation, it should have been classified Division 1 – no matter what the auxiliary systems do. See Section 500.5(B)(1)(3).
Edit Add: Added [immediate]