Day 1

Anguis should have realized the only reason he as an adventurer would visit tomb in a company of a guide who knows about the traps in it is to steal some ancient artefacts protected by no living creatures but only by traps, undead or .... as you just experienced-constructs

Bellow look at those tall and emaciated-looking humanoids with their skulls long and angular, deep-set eyes, flattened noses, and long pointed ears. You remember - they tended to train in martial combat and fought as monks. Monks weapons of their champions were burrowed in tomb like this upon the death.
As a result tombs were usual target for adventurers and Githzari put enormous effort into building traps: physical and magical means to kill those who dares to steal weapons. They would usually hire masters craftsman of different nations and races as they were not proficient in building protective measures.

Anguis touches the wall and memory flashbacks allow you to conclude following:
There should be a safe path through this tomb connecting all altars, rooms and entrances. They could be stuff hiding the path from unenlightened. Such as hidden doors, illusory walls.

French yourc hoice. Anguis were busy in the memories. Should Elrond move really slowly but determined I would allow reaction just because it is no more dark

There is a problem is finding path: the floor is covered in deep dust. Around you - where you just had a battle and as you have light now you clearly see no paths (looks like people came here seldom to never).

Actually, since Anguis light spell shed dim light 40 ft and you all have dark vision, you could see small scratches on the wall at doorway to the right, where Elrond wanted to go. You could make a conclusion something have been carried through those doors. You do not see any of those on the doorways you just entered (one below you in the battle map).