Next time, you speak after the tone

Another few lines from Carol Ann Duffy, this time from ‘Quickdraw’, again published in Rapture:

You’ve wounded me.
Next time, you speak after the tone. I twirl the phone,
then squeeze the trigger of my tongue, wide off the mark.
You choose your spot, then blast me

through the heart.

These lines express so well how we sometimes wound each other, indeed, how we snipe at each other, in what we say.