Megatrain's story/Megatrain kills Tirek and regain his arc

This is the scene for where Megatrain explains his disappearence and how Tirek betrayed him, and where he kill Tirek and he regains his Arc.

Megatrain: [takes his fusion, plasma cannon and points it a Tirek and cocks it]

Tirek: GASP

Megatrain: It's a new era Tirek, there's no room for guys like you when there's guys like me. Especially when guys like you betray me!

Princess Celestia: