The Gasping Maw is alive.
While the Gasping Maw is alive Venomshade can use Stagnant Wheeze.
Venomshade's Gasping Maw is alive allowing the beast to spew a Stagnant Wheeze hitting all enemies in a frontal cone.
Killing the Gasping Maw will prevent Venomshade from being able to use Stagnant Wheeze.