Sansa nods her head. There's a gelding that she's already deemed gentle enough to ride and she offers it to him since he seems to have a fear he's trying to overcome. She feels safe enough riding on the mare for now. She doesn't think either will throw them but if one will, it will be the mare and not the gelding.

"Why don't you take that fellow and I'll take her? We can start out on an easy and familiar path and you needn't worry about things. They're tame enough to be ridden by now, I think, so long as we are slow. We're both slight so they won't spook at our weight."