There's a pause here, the memory of a total disconnect from the familiar presence of something other fresh enough to afford it a moment of contemplation. Even if separation from Jon's package deal entity is likely a welcome reprieve, it's indicative of a power Ambrose has that is too great for comfort.

Finally, and with some humour tucked into the dry, wry wording, "So much for not relying on your Eye in the sky."

Because he's assuming that's what happened. Knowledge sought and found and Ambrose unimpressed by the intrusion. There's no judgement. To the contrary. It's only at all funny because they'd spoken about it before Jon went so directly against his own advice and because, given the opportunity, Stephen's sure he'd have done the same thing.