Did Deathstroke appear out of nowhere in that battle? I thought he was on a different ship.
He was, but presumably when Miss M "accidentally" shot the camera out while trying to protect Kaldur he decided to catch up and come aboard - right about the same time Crusher and Jade were leaving.
Although I do wonder why he decided to suppress Miss M's telepathy if he thought she was trying to save Kaldur.
I was joking that he was on babysitting duty, but they actually covered that.
"Roy dear, I need you to watch Lian for a couple days."
"Um, sure. Any particular reason?"
"Oh you know, father-daughter time."
"Alright, try not to get killed. And bring back a souvenir, you know how Lian loves those."