Batman should be phased by seeing a bunch of indestructible nikkas flatline an entire city in a one-on-one and damn near destroy a planet before that
Remember, this is supposed to be Batmans first run in with Supes... He doesn't know anything about anything in regards to Superman, Krypton, etc., at this point in time.. He's not even called Superman yet. All I can imagine is that Batman views Superman as an enigma and a serious threat no matter who he saves
And this is the movie that sets up for the Justice League movie, so I expect a lot of cameos