Headscratchers / Tails Gets Trolled

• So, if Rob can't hear anything, and no one is seen trying to make effort communicating with him, how does he even know what's going on in the particular moment?
  • His ability to read lips was actually confirmed in Chapter 24◊.
• How did Luigi cut the Troll King's arm off with a hammer?
• Why did the bullet that killed Petunia and Porky Jr. just stop? It looked like it went from full velocity to falling harmlessly on the ground. One baby's head should not be able to stop a bullet like that.