Unfortunately for Yui, Vermouth has a very perceptive eye. Of course she wouldn't need it to notice the fuss, considering how loud a child's tantrum can be.

Luckily though, as a teacher "Christina" happens to have experience with children. Enough that she decides to try and help out.

Putting the gloves back on the rack, she slips through the aisle until she reaches the other side where the commotion is happening. She offers a gentle smile to the older sister. "Is everything all right?"

Obviously not, but better to ask before offering assistance.