Nydella smiled, staying perfectly still until the plane lifted itself into the air. Steve seemed to get a little sick at first, but that's understandable. After all, he's still adjusting back to the normal world after being frozen for years. As the plane was directed to the Hydra base by Hawkeye and Natasha, Nydella unbuckled her seat belt and went walking around the cabin. She stopped in front of Tony, pressing two fingers to the underside of his jaw without saying a word. 

Steve watched curiously, kneeling down at her side so he could get a better view. Nydella then pulled out a syringe from her bag, tapped it twice, then injected the amber colored liquid directly into Tony's throat. "There, you'll need that for the temperatures where we're going. To ensure that your core temp doesn't drop below a healthy degree." 

"What was that?" Steve asked, watching her do the same to herself and then readied the syringe for him. 

"It's a self warming injection of my own design. I have it customized for everyone's individual needs. For example, my core temp is lower than Tony's and yours is higher. I made sure each injection was perfectly measured for the specific person." She gently repeated the injection with Steve and smiled after wards. "Didn't even hurt." 

Steve nodded, "Thanks Doc." 

Nydella blushed, standing up and went to give the shots to Hawkeye and Natasha as well.