Commuting is processed first on top of strongman. Strongman breaks through BLOCKS, you cannot break through a block if the target cannot be found.A Jailkeeper cannot stop afrom committing a kill (regardless of who they target), and does not prevent other players from targeting their target with non-killing actions (e.g. if a and Jailkeeper target the same player, the Watcher will see the Jailkeeper's action).
What you describe is an Alien. Just took it from the Mafiascum wiki. MU wiki says the same.