No, I made it up when I was being attacked and it worked. Try it and you’ll just figure it out it’s pretty natural.
For a good visual to inspire you, I posted on here before the fight scene form the bar in Queen of the Damned film, where Akasha burns all the vamps in the bar to dust (the last minute in this 4 min video clip). They sort of burn up from inside. Don’t think about it too hard just easily and firmly see it happening.
If you want a good book on dealing with all kinds of parasites, I like Josephine McCarthy’s Exorcist’s Handbook. You have to read between the like with the JCI bent but the information is very good.
That’s a good start, but intend the damage you want to see as well. For cages use metal, very thick, very heavy metal, even box them in in 12 inch thick titanium if you want. They can slip out but put it right back; you’re faster. Metal is a good tool all round.
This is how magickal fights work: you try something, they beat it and come at you again, you beat that and try something else… until you find out what lets you win. You don’t give up just because one punch didn’t do it. It had an effect right, so it did work, you just have to up the ante.
As you’re depleted, add pore breathing (search top right for how) so you’re pulling in new energy and not just using only your own.