The scene required her to be very angry and slap Ayushmann in the face. However, she flinched every time she went to slap him.
She was very conscious and tensed about the act as she had to slap him.
She had to give multiple takes for the same as the timing of the slap was not perfect. After the 6th or 7th take, Ayushmann joked about how Bhumi is enjoying this scene and so purposely doing this.
Ayushmann then had a serious conversation with Bhumi and made her comfortable about the slap.
After the mini pep-talk from Ayushmann, Bhumi isolated herself for 15 minutes and when they came back she delivered the shot brilliantly.