Originally Starscream stopped by the medbay looking to see if Ratchet was there. As soon as he saw the small ... human? Robot human? All thoughts shattered and he completely forgot why he came there in the first place. Call it scientific curiosity or just plain being nosy. Either way, now he's very much distracted.

The large seeker stepped on closer though he was sure the person had seen him already (how can anyone miss something as big and glorious as Starscream anyway).

"You're new. Also a ninja?" The guy had a sword like a ninja, he's seen TV before.

For all he knows the humans probably created some sort of robot ninja just because they could.