A few words in Luis's earpiece told him to stay quiet and let Maribel lead the conversation, but when it was possible, without causing undo attention to get her to a place where she could be retrieved by the LTIV booth. Use the post-hypnotic commands, if necessary.
As he watched Maribel face down this dangerous man, he marveled at her courage. It occurred to him that although he himself knew she had a shield ring, she had no idea. She thought Rafael was protected by a simple bullet-proof vest, while she herself was unprotected. Yet, she had charged into the gunfire even more bravely than the two men since both he and Rafael knew they had at least some protection from the bullets. Incredible.
