I think the first one is fine the way it is.
For the second one, I think there's too much dialogue. Comics need to be simple, you gotta setup your plot quickly and effectively.
First panel: Introduction of the ghost and the reaction from the marine, firebat.
Second: Have them pick on the ghost (pick your favorite line, you can also make one of them a good guy like Khuutra suggested)
Third: Just the ghost leaving (Maybe use the line "I'm gone!" and a bubble coming from off screen from the marine like "Yeah good ridance"
Fourth: Marine "Ghosts are so lame"
Fifth: "Nuclear launch detect"
Sixth: "Ohhh shit" from Marine (if you decide to make the firebat a good guy you can add something like "You and your big mouth!"
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