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You are right B.Safety comes first and people should keep that in mindEven a gas cooker can be dangerous, especially for people who try first time to flambe apples with brandy(p.s you can hot knife the bud on a gas cooker!)Butane and other gasses are super dangerous to use indoors. It looks from your pictures that you are using butane indoors ... please do some research before you blow yourself or other up and burn your house down
https://www.icmag.com/ic/showthread.php?t=266761
https://www.icmag.com/ic/showthread.php?t=212613
Please review both links ive posted before futher butane use... it could save yours and others lives!!
Cover the bowl with a wet towel when spraying!!!In your garden if you like.One burst 10 sec and for the amount of gas used in my photos,1/3 of a can.Then place the bowl in warmish surface with towel still covering.don't want to be that guy and a pain in the ass, BUT, blasting indoors is a hell of a lot more dangerous then doing hot knives on a camping stove, if you were not aware, you really need to read up, any tinny spark can cause a blast, even things like a fridge pump or a pilot light in the cellar, even static sparks have been known to cause someone to get blasted instead of blasting the weed. at least go on your garden or balcony to do the actual blast and hot water bath boil off process