To make everything easier for the author and readers:
Shidi = younger fellow male disciple
Shijie = elder fellow female disciple
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A sharp 'shing' of a sword being drawn filled the little hut, and the two captives watched in awe as the slender blade lit up with purple fire before it cut the tree root cleanly in two. The Diefa disciple named Shuang dropped in an unceremonious heap on the ground, groaning in pain.
"Get up, Shuang," Lu YaYan ordered as she let her sword slide back into its holster and stepped over her shidi to get inside the hut. Few other disciples were waiting outside, and one reached out to pull Shuang up on his feet and out from blocking the doorway.
"Lu YaYan," MingYu gasped, both in relief and fear. He wasn't sure if she was a threat or not, but at least she wasn't Lan Guan-Yin. Thank Heavens.