Tahr, who was alongside Celica and a good distance behind Rasul and the other captured prisoners, backs up as Rasul charges towards him, having plenty of time to prepare. He rubs an oiled cloth along his knife and assumes a defensive stance, waiting to lash out the moment Rasul makes a move for him. As Rasul barely manages to get a loose grip on the edge of Tahr's pants, he uses the opportunity to make a shallow cut between Rasul's thumb and index finger to prevent his hand from grabbing anything but the edge of his pants.
The assassins grab Rasul and pull him away causing Tahr's pants rip slightly as they are pulled down, revealing female underwear and very recently shaved legs, perhaps somewhat more feminine and shapely in appearance than would be common for a Gerudo. Tahr was currently at little risk of being given away—it was not uncommon for him to have to strip down to his underwear in the common changing areas and he'd taken the necessary precautions to make sure he wouldn't be given away so long as his underwear wasn't also removed, with a bit of clever rearranging.
Tahr blushes and pulls up his damaged pants to cover himself, feigning a healthy dose of both modesty and embarrassment. His voice and appearance both refuse to betray him, having practiced this role for months.
"Y-you disgusting brute! I hope it was worth it, you perverted midget."
Tahr retreats behind Celica, making sure that any further attempts to assault him would be met with direct intervention by the much more powerful armored warrior.