Re: At the Exposition Seats
Marian heads to the vendors, only a few of them open at this point, mostly doing prep work, as there aren't many customers around yet--just guards and workers. Several of the vendors do, indeed, have buckets of sand hanging near their stoves. While electrical fires aren't commonplace yet, grease fires are.
She doesn't need to take the whole bucket, just a few handfuls... or cupfuls. Marian has enough sense not to mention a bomb, but finds a suitable emergency 'excuse'.
Meanwhile, the Directeur tells Rosabelle that there are sand buckets in strategic places in the nearby building, and hurriedly escorts Rosabelle to the nearest one to fetch a bucket.
Grimsby and Bellgrove are still frustrated by the Vril, who refuses to cooperate or even say much. So far, the bomb has not gone off, and your compatriots are still working on it, apparently, rather than everyone having fled the scene.
From his current position, Grimsby can't see the other side of the grandstands, though, and remembers that the other Vril was going to circle around to the other side and set off the bomb manually, if necessary.