@kwendy not just that, they're taking the crystallised emotions and using them as part of something else, from what the last part of that chapter shows.
"Just a little more..."
They're being manipulated into thinking that taking emotions is the right thing to do, and they're being fools - dangerous fools.
Kind granny with lots of experience vs stupid children. Eh... Now I start to believe that making Magical girls from grannies is a great idea. (Of course if they're not meant to be fooled, looking at you Kyubei)