They've just hauled themself onto a particularly intact and vertical-resting pillar, having used a crumbled bit of wall as a platform, when the sound of crunching stone underfoot catches their attention. The stride is deliberate and slow enough that it registers as unthreatening, so Frisk takes their time wobbling to their feet on the uneven square that forms at the end of the pillar.

Once they're assured of their balance, they turn to the source of the noise with a downward glance. It's Lup, making her way towards them -- though, wait, that's not right, they realize with a jump of their eyebrows. That's her brother, isn't it?

They respond to his hail with a wave of their hand down at him; no summon circle for the stab twin in sight.

"Nothing. It's looticrous."

I guess we're just starting off on this foot, then.