Lena blinks curiously for a moment, eyes narrowing when she doesn't spot Sombra. Just as she's reminding herself that, yes, she's in a legion of superheroes and this woman probably has something of her own to help her get around quickly, she's struck in the back of the head with a snowball.

Unsurprisingly, she makes a yelping sound ("Oi!") and stumbles just a bit as she tries to rapid-turn and throw before Sombra has a chance to get away from her.

"Come back here!"