"Of course, he went and actually promised her safe passage. Still."
"How do I know, though," says the Witch daringly, "that the promise will be kept?"
Her servant has a moment of visible terror at the lion's roar, too—but he still laughs as he turns away, not tarrying but not fleeing either.
"What did -" But there is an atmosphere suggesting that this would somehow be a deeply personal question to ask of Aslan. She swallows it after those two words, and goes unanswered.
James silently echoes Bella's curiosity, and similarly restrains herself.
Bella fills in her current best map when he mentions places, and takes notes as they walk - it turns out her staff still works tucked in her elbow even if she doesn't touch it to the ground step by step, so she has a hand for the notebook and a hand for the pen - but asks: "Aren't you going to be there to lead everyone? Are we going to be handling detachments and need to coordinate?"
As soon as Bella asks the question, James suspects she knows the answer. But she waits for Aslan to speak.
"I suppose there are a tremendous number of countries that need your attention or Narnia wouldn't have had such a long winter at all," says Bella. "And you might be called away. So if we can handle it we should, but it's only we have not actually commanded armies before. Are there more experienced creatures who could do it?"
Yeah, James has her suspicions about that noncommittal answer. But presumably Aslan has reasons. She pays close attention to everything he says about the coming battles.
It occurs to James that making camp on this side of the river is an interesting choice, but she doesn't say anything.
"Hadn't we better go ahead and ford it," says Bella, "so if the Witch's people come at night we'll hear them splashing?"
Bella doesn't seem to be picking up on any inferences, she's just sort of moping on the reconstructed cushion heap, looking at her map in the dying daylight.
"I think Aslan's going to go let the Witch do something to him," James murmurs. "And he's bound to have some kind of plan that makes that a less obviously stupid idea than it sounds, but I have no idea what it is."
"...What - let her hurt him instead of you? I guess she'd take the bait, she hates him like nothing else, but - I hope you're right about the plan."