Having turned a good deal of Jaime's army into roast Lannister, Dany will clearly open this episode doubling down on her assault by attempting to make what remains of the army pledge to her. It might seem an unlikely prospect, since in their eyes she's basically a dragon-riding Hitler, but she is promising them death if they don't. Always a compelling argument.
It's also no accident that she's coming off a little Aerys here: the whole point of his story is basically a morality tale about the temptations that anyone can be driven to. She's Othello, attempting to resist Iago's tempting pull towards evil but ultimately doomed. And we all know what happened to Othello when he went to the dark side.
It's actually pretty impressive that this many soldiers made it out alive. Presumably there's not an eyebrow between them.
Dany cuts a fairly fearsome figure, even when she's almost at ground level with the soldiers, but then a dragon sitting just behind you will do marvellous things for your propaganda.