As Luise says, although we are completely protected from the dragon golem’s attacks like this, it seems to be displeased that we aren’t dying at all.
It is firing breath and tail attacks in rapid succession as if it had gone mad and thus it was preventing any chance to leave and attack it.
“However, it is quite good to be able to spit out breath attacks like this continuously.” (Ina)
“I guess there is a very excellent magic gem embedded inside.” (Erwin)