Arthur frowns at all the noise in his ears but is grateful for the speed. He looks back behind them occasionally. Before he's looking forward and tapping Max. He yells, as loud as he thinks he needs to be over the engine and wind, "Avoid the dark spots!"

Max will see one nearby. And then another and another. There's enough space to drive between them and they would be better off for it. Driving over could lead them to getting the bike stuck in a sink hole.