I got banned for insulting the last guy who decided to burn a spider. My position on this should be pretty clear.
Burning a defenceless animal is pathetic and childish, and proves nothing. You are seeking attention by posting this here, hoping that you can generate a 40 page wonder thread about how you're too immature to just release it in the house, or even outside if it bothers you that much that it's in the house.
If you absolutely must kill it, do it quickly.
And I'm gone.