It's like a random person got his bag snatch, you try to help the guy(that's slow). You try to pursuit the snatcher but you failed and the guy started to insult you.
Yea, i know. In this case, it's a child for those yukkuri. But still, Reisen isn't obligate to save her. She can totally just don't give a fuck about this family.
Plus... Is Reisen too slow? I think Komarisa is way slower than her.
Reisen has a good heart. If it was me, i would smash the hell out of this reimu with the orange juice bottle.
PS: I see usually bodies yukkuri as superior form of yukkuri.