Hevee
Speaking of people who would have gotten to the tower shortly... Well, not necessarily 'people' per se... Actually large, gender-neutral industrial androids... Althought of a decidedly masculine body shape - Oh, you get it.
A very lucky errant grain of sand entered through a tiny chink in Hevee's cranial casing and lodged itself in the circuit controlling its manipulator claws just as Jezebel jerked the Heart Stone from the massive robot's grip, causing its left claw to suddenly open and allow her to get away. Somewhere inside its circuits, the robot was using every angry word it had ever recorded on the docks in every tongue it knew, was programmed with or had only heard used in passing around him. The robot immediately 'floored it', as it were (even though there wasn't a floor) and stomped from the deep and shifting sand onto the dried, hardened salt pans around the tower. This gave it the advantage of a good grip on the ground, and allowed it to move even quicker than before. Observers would now note that Hevee, shedding sand from every gap in its chassis, was sprinting at the tower, on a dead run towards Jezebel. Gears were grinding and screaming and servos whirring, giving the sound of a banshee torn from hell itself to the sound of the charging robot as it thundered across the hardpan, its brain clicking out a message to Jezebel via the Deus Ex Machina:
'RETURN THE STOLEN HEART STONE OR YOU WILL IMPACT THE TOWER WALL AT HIGH VELOCITY DUE TO COLLISION WITH THIS UNIT'
It was clear that he wasn't screwing around anymore.