Unknown to Clint or Natasha, after they both fell asleep, a guard crept into the room and sedated Natasha.
Clint wasn't sure how it happened but by some sort of primary instinct, he woke up just as the cloth was placed over his mouth. Again Clint found himself holding his breath, he struggled and this time, being unchained, he kicked his way away from the guard, going into a fight stance.
The guard quickly said something in German into an ear piece and two other guards came in and pointed guns at Natasha's limp figure. There was no way they would miss if he went to attack them.
"Kneel down and put your hands on your head." This guard had a heavy German accent and spoke in a deep voice.
Clint stood for a moment, still in a fighting stance, concise ring his options. He could attack them and Natasha would most likely get shot, or, he could give himself up and submit himself to the next round of torture they threw at him.
He didn't think he would survive losing Natasha, so, reluctantly Clint placed his hands above his head and knelt down. The guard with the deep voice moved forward and placed the cloth over Clint's mouth.
There was no point in fighting the sedation, if he did they would just threaten Natasha again. So Clint took a deep breath, welcoming the dark sleep.