I'm confused by inconsistencies regarding the dragons
Spoilers ahead.
There are two things that make no sense to me.
Thing 1:
Is anyone else also upset at how easy they are to injure? First with a simple poke from a spear in Daznak, and now recently with the crossbow.
We were shown when they tested the crossbow that it penetrated an old dragons skull, however that was at close range. Furthermore, the skull was at least over 300 years old and had no scales and hard skin to protect it.
Bronn fired the crossbow from a considerable distance (compared to the test on the skull) and yet it still managed to injure Drogon. It is as though the arrow lost absolutely no power or speed despite the distance it was fired. We also see that Drogon has massive scales protecting his skin, so I find it very improbable an arrow not fired at point blank range would have done any damage.
We also know that about 300 years prior, 3 dragons were used by the dragon kings to unite the 7 realms. Are you telling me nobody had a spear or an large arrow to poke or shoot at the dragons with? Why were those dragons so indestructible yet we see currently they get their arses handed to them every time they come out to play.
Thing 2:
Also, why the hell is Denaeris going into war with 1 dragon when she has 3? Did we not just hear her threaten to jump on a dragon and fly all three over to barbecue the Red Keep a very short while ago? She is definitely alive to the fact that she can use all 3 at once (duh!). Jon snow convinces her that it would be wrong to do so since she would then be no different from those she seeks to replace (presumably due to how many innocents could be harmed).
Seriously though, if you are going to use a dragon, why not use them all and end it quickly? By not using the full might at her disposal and ending the fight quickly, she is actively allowing more of her soldiers to die in the battle.