Clint helped Tony work on the suit. He seemed very focused on what he was doing. Though he too soon heard noise, He tensed and looked around. He hoped Natasha was alright. He was shaking a bit.

"Tasha ...," He was really confused what was going on. But he was freaking out. He heard Loki's name mentioned. He hadn't though it was to do with Loki. His eyes were wide with fear, He looked at Tony and Steve.
"I can't let her fight alone either." He was scared.
The archer wondered if it been to do with Loki was why she hadn't wanted him to go with her.

He wondered if Loki had sent somebody. That seemed likley enough.