There's a loud shreik from somewhere overhead and out of the wine-colored sky dives a goshawk straight for Lydia's face!
Lydia The bird is Tiny--big for a raptor aiming to nest in Lydia's face, but Tiny with a capital 'T' by the rules, and so it has to enter her space to attack granting Lydia an AoO.
talon v Lydia (charge, higher ground): 1d20 + 7 + 2 + 1 ⇒ (19) + 7 + 2 + 1 = 29 damage: 1d4 - 2 ⇒ (1) - 2 = -1 That's 1 nonlethal
"Aha! Mon Triumph 'as arrived!" cries Lady Rhiannon.