It takes a lot for him not to verbally announce his displeasure but if it's working, then he can't complain. Even if they know others are there, he'd rather stick to the stealth for now. His eyes turn away from the bird to the spider, watching it descend closer towards Papyrus. The look on his face definitely shows his mood but he shrugs gently on the shoulder Lambert isn't on.

Half of him wants to go check out where the mirror is but he isn't entirely aware of how well the Architects can see them, nor can he really spot the webs or navigate around them. They spotted Rita and Childermass after all, somehow. He looks towards Lambert for a long moment, considering moving but then just doesn't. It's not worth it without a proper plan.