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It looked like the horse of the Golden Companies commander? 

6 hours ago, Zorral said:

If one wished to provide a sort of insightful credit to writers that they certainly have not earned in any way, it would be what happens when human beings achieve free will, rather than being enslaved objects of others' will.

Daenerys broke the Unsullied's chains.  They now have personality and character and choice, as we see grow within Grey Worm over several seasons.  Part of that was learning to love someone, someone, again enslaved,  helpless and without power, killed for no reason other than Cersei being the crazy mad eviLe b*tch she's always been, using Missandrei as an object lesson.  So, it was Torgo Nudho, meaning in High Valyrian,* "Grey Worm," who makes the free will choice -- his own choice, not an order -- to kill.

As I commented, the showrunners didn't earn that. It wasn't there on the screen.  I brought it.

*  I have no idea why at that moment Daenerys speaks to him with his name in High Valyrian.

 

My thinking of this was that they have had some prior discussion and have come to a plan themselves regardless of what Tyrion or Jon are saying. When she says to Grey Worm "you know when" or to that effect is that its as if she had already decided what she was going to do. "The Bell" was the trigger for her and for Grey Worm to exact revenge.