Jamie had been keeping an eye on Kaylee as she made her way up the ladder, and continues his "attempt" to sit down until he's sure she's all the way outside.
Once he's certain of that, however, he quickly stands back up and makes his way over to the ladder, fully intending on sneaking his way outside and making sure she's safe. The Doctor has problems keeping Jamie from doing things like this - there's no way Jamie's going to let Kaylee keep him from following.
He's actually managed to make it partway up the ladder itself when Kaylee's face appears in the hatch and Jamie is well and truly caught. Oh well, he thinks, when she starts yelling, at least she doesn't know his middle name. He doesn't think she does, at any rate.
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Once he's certain of that, however, he quickly stands back up and makes his way over to the ladder, fully intending on sneaking his way outside and making sure she's safe. The Doctor has problems keeping Jamie from doing things like this - there's no way Jamie's going to let Kaylee keep him from following.
He's actually managed to make it partway up the ladder itself when Kaylee's face appears in the hatch and Jamie is well and truly caught. Oh well, he thinks, when she starts yelling, at least she doesn't know his middle name. He doesn't think she does, at any rate.