Blood Spats and Bullies

Half-blood, they say, like it's a curse. Harry tries to understand, but then, he doesn't want to. Doesn't want the twisted logic to make sense - doesn't let it. And he's glad he hasn't, the day he finds some Ravenclaws cornering another firstie in an abandoned hall, throwing words about weaker magic and tainted souls, mixed-breeding and corrupted lineage. They're taunting and towering, and he sees some hunted look in her eye and a shimmer on her cheek and when they raise their wands at her, he raises his and steps in-between.
In which Harry struggles with bullying and blood prejudice, but ends up making a new friend.