Think about it like this:
He's stuck between two mirrors facing each other that represent resentment and regret. "One single image frame i wish to forget now replayed in succession of millions"
Because of this he cannot escape and is forced to see the same negative imagery as it repeats itself from either view. Resenment overtakes as he looks to lash out in anger and spite but the fear of regret holds him back so ultimately he never actually does anything.
"Spit of hate suspended mid-air" - He wants to but he will forever dwell upon the idea but never take action.
He takes no action and will forever dwell on past actions and those he has not done. He is left to sit and think.
Think about it like this: He's stuck between two mirrors facing each other that represent resentment and regret. "One single image frame i wish to forget now replayed in succession of millions" Because of this he cannot escape and is forced to see the same negative imagery as it repeats itself from either view. Resenment overtakes as he looks to lash out in anger and spite but the fear of regret holds him back so ultimately he never actually does anything.
"Spit of hate suspended mid-air" - He wants to but he will forever dwell upon the idea but never take action. He takes no action and will forever dwell on past actions and those he has not done. He is left to sit and think.