As the threat posed by Ra's al Ghul (Matt Nable) looms over them, Oliver (Stephen Amell) desperately tries to hold together the uneasy alliance between himself, Malcolm Merlyn (John Barrowman) and Thea (Willa Holland) on Wednesday's new episode of "Arrow." In a clip released Tuesday by The CW, however, Thea may have made a move that even Oliver didn't see coming.

The first scene from "Nanda Parbat," this week's episode, finds Oliver and Thea at odds over their work with Malcolm. As Oliver berates her for letting a secret slip, Thea hints at another that may put all of their lives in danger.

In the second clip, Nyssa (Katrina Law) attempts to exact her revenge on Oliver for the death of her love, Sara Lance. However, their confrontation distracts them just long enough to lead to the Merlyn's escape.

"Nanda Parbat," the latest episode of "Arrow," airs 8 p.m. Wednesday, Feb. 25 on The CW.