@ApolloX1209 : I don't think so, the cover only show the princess (ch1-2) and the Guild girl we saw here (ch3). If this dragon was a girl, that we see so soon, she should also be on the cover.
... well except if she only come back in a few chapters of course.
The jp term translated as "holding back" is 手加減, which literally means adjusting to something on the fly, but in a fight is typically used to represent going easy on a far weaker opponent in order not to completely overwhelm them (i.e. holding back).