Help me settle a debate abt episode 5

Ok so me and a long distance friend are watching yj s3 and we call every tuesday to talk abt it and today we got into a disagreement.

Soo, Did shauna (well mellissa) cut coach bens achillies out of like shaunas own personal decition or was it something the group agreed on and sent her to do, (i thought it was a group agreed thing cuz of the no need to be a saint abt it comment and also cuz they tend to send shauna to do the dirty work in that sense like w javi, but my friend is very intent on that this was shaunas idea and its shauna going like crazier or smth)

But what do you guys think?