Object dragged over question

I am building a course on using fire extinguishers. I am trying to have an interaction that has the spray of the fire extinguisher trigger the fire to be hidden. What happens though is that any part of the fire extinguisher will trigger the fire to be hidden.

I also tried to create the spray separately and then group that with the fire extinguisher but that didn't work either.

Does anyone have an idea on how to create this interaction?

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