4 at once

Vader waited until they were nearly to him. Then, reaching out to the Force, he stripped away the section of stone-hardened cloak that he’d wrapped around his left arm and sent his lightsaber from his frozen right hand to his left.

The Darshi had barely enough time to jerk to horrified halts before Vader slashed the red blade through all four of them.

- Thrawn: Alliances, Chapter Eight, Page 219