Midway through the mission, you'll face a Yiga Blademaster. These enemies are fast and can teleport. As Zelda, use Stasis to freeze them when they appear, then follow up with a series of heavy attacks (X). Her charged heavy attack (hold X) can also deal significant damage and break their guard. If you're playing as Link, use his Flurry Rush by perfectly dodging their attacks to create openings.
The Blademaster will often try to target Zelda directly. Prioritize them immediately. If they start their spinning attack, block or dodge away. Once their Weak-Point Gauge appears, deplete it quickly for a Weak-Point Smash. Defeating the Blademaster will clear the path for Zelda to continue her journey. Collect any dropped materials, as Yiga enemies often drop valuable items.