Shippy Sunday spin!
Spoiler:
Perhaps Rodney reacted with an interested sounding "hm!" when he saw Elizabeth with Mike because he may have realized that Elizabeth's attitude toward dating coworkers/subordinants might have changed? I get the feeling that Elizabeth may have intentionally or unintentionally made her feelings about dating others on Atlantis known to Rodney earlier (perhaps another reason why he's now with Katie?) The "hm!" could have been "hm! That obstacle may now be down!"
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