It took all of ten seconds for Ian to catch Mina. The look of fear on her face was real, but he was not truly upset with her. He knew it was a joke, cruel, but a joke, nonetheless. He just wanted to make sure she never got it in her mind to do something like that again, so when he caught her, he hoisted her over his shoulders, brought her to the shore, and chucked her into the water, nowhere near as rough as Drax had been.
Mina splashed out of the ocean giggling. She was not panicked because she could touch the bottom, and now that she knew he was not as angry as he appeared, she allowed herself to continue laughing, until she caught sight of Mills being pressed into the sand by Drax, who was kissing her in a way that spoke his intentions.