Hold your breath

When I needed to bake a fish cake a few weeks ago, Murphy fashioned a breathing aparatus from a fishing bowl so that I could go under water and get me some crab. Today on my way up the slayer castle while my mose hurt from the peg needed against the stench of the abberant spectres something dawned on me. If the diving aparatus can shield me from water, it should certainly shield me from the gas that spectres use on their victims. Apart from the obvious benefit of not hurting your nose like the peg does, wearing a bowl does not require any slayer training. Something to try next time I venture there?