<human>: Can you provide a brief rundown of the text in within 3 sentences?

This happened literally 5 minutes ago, and since then I've been sitting here numbly, standing in the tall grass, kicking myself for being such a dumbass.  

I was playing B2W2 and (warning for post-game spoilers kinda) running through the Pinwheel Forest with Cheren in post-game.  I was wading through the tall grass after retrieving an item and, of course, random wild encounter.  Standard annoyance.  

Since Cheren's there, we get a double wild battle of two Swadloons.  I get kind of confused as the sprites load, and then proverbially shit my pants when that familiar shiny sparkle and sound effect comes up: *one of the Swadloons is a fucking natural, wild encounter shiny.*

I've played easily 500 hours of all different versions of Pokemon, and this is only my second natural shiny.  So, of course I begin to freak out and blindly panic, because *SHIT* I'M WITH FUCKING CHEREN, HE'S GOING TO KILL IT BEFORE I CAN CATCH IT SHIT SHIT SHIT.  

Well, turns out Cheren didn't have to lift a finger.  Because whilst incoherently spasming at my DS trying to open my bag for a Quick Ball, I accidentally ran away from the battle.  

I am such a fucking dumbass.
<bot>: While playing Pokemon Black 2, I encountered my second ever wild shiny, but accidentally fled from the battle because I was freaking out too much.