Why was it up to Kung-Lao to save Raiden in Vengeance?

Why was it up to Kung-Lao to save Raiden in Vengeance?I mean,Raiden's a GOD,I'm pretty sure he can take care of himself.

And instead of just WARNING Kung-Lao to stay back,why didn't Raiden jump through the portal and attack the Shadow Priests?

I don't understand why Kung-Lao felt he had to return to that place.


I should have known those alien maggots booby trapped this sub.