Snape blinked at being compared to Harry, though the next moment he shrugged inwardly; he supposed it did made some sense, galling though it was. The unreserved vote for the importance of his life was still surprising at a deep level; Snape wondered if that would ever entirely fade. All he could do was murmur an entirely inadequate, "I appreciate it."
He inclined his head in mute thanks for the clarification about killing the baby. He didn't have much room for complaint on that score; he'd done his own share of killing.
But the question of whether he trusted his mother, far from being weird, was really an extremely pertinent question; he gave it the full consideration it deserved. "She's a survivor. Good at lying low, blending in. But, like me, she's possessive. She doesn't want to die, she doesn't want the child killed, and I really don't think she wants me killed. And she knows as well as we do that she and the child would be dead or worse, if she ever attracted the attention of Riddle or his forces. We can trust her, because her own interests align with ours."
He took a while to think about James' plan, then nodded slowly. "I think it's the solution that best minimises the risk to the castle. Breaching the perimeter once is clearly less of a danger than doing it twice."
He looked from James to Alastor. "How soon can we bring them in?"