I didn't really expand on what happened after Lakshman tells Urmila that he heard her sister scream so in this chapter that's what you will see
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Urmila nods and says "I am. what are you doing here?"
"I heard your sister scream so I tried to follow her but didn't find her," states Lakshman
"wait you came running from that way right?" Urmila asks once Lakshman nods she carries on "there is a cave there. when we were kids Mandavi didi used to hide there when she was upset. did you check there?"
when Lakshman shakes his head. Urmila sprints off in that direction. Lakshman follows her. Urmila stops by the cave and goes inside. she sighs once she sees her sister.
"didi you aren't hurt?" Urmila says after breaking away from the hug she gave Mandavi
"no urmi I'm not. Lakshman Ji wanted to prank you and so I helped him," Mandavi replies
Urmila glares at Lakshman and stalks off. Lakshman follows her and tries to apologise but Urmila doesn't listen. she goes straight to Ram and tells him what happened. and obviously Ram tells his brother.