rae2nerdy
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Maybe it's just me being stupid, but I see absolutely no reason why the first version is worse than the second one.
Because she would grab a gun isn't an action. It's more like the pov character (she) is daydreaming about doing something. So from the other character's perspective pov character is just standing there doing nothing.
Whereas she grabs a gun is an action that actually takes place and thus something the other character can react to.