Even though the key is covered by toxic gas you can pick up the key. This may not break the level but its annoying to complete the boss and still have enemies around.
Your supposed to restore the power, kill the turret, go to the ventilation terminal to blow away the gas. Then pick up the key, kill the vular and move on to boss.
Its a small issue but annoying when someone just runs up and takes the key. Cause then i feel obligated to stay behind to kill the vular. So that the group will stay together.
Now this also happens in another level but im not sure which one.
Here is the corpse where the key is found. Notice the gas is still covering it.
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