Contained.

Okay - pokes in the eyes for not capitalising your I words! lol. But,... onto the poem.

The tone of this poem was very fitting to the darkness/mystery of Halloween right now, great timing.

I think the use of the brackets really worked in your poem, I know many people throw them in through poetry and they never really have a good affect, but I feel in your case that they achieved a greater impact of what is inside them.

I like the content of the poem, and how the character narrating seems to hold these very powerful feelings toward the second character, who on one way was more powerful, but perhaps not as powerful in the end by the time your anger had built up and had been released.

the power to detonate
in my fingertips.

- what a really powerful imager to portray power, a finger tip so small, yet can create so much damage in this case!

I also again like your title choice because it seems you do not want to be in this place mentally but you feel contained there? Like you are trapped within this dark mind set. also, I think it represents the second character becoming contained as something quite twisted in your head too. Nice word to pick.

Creepy and mysterious write. Nice wording.