The enemy already knew that Kurt and Lark were around the moment the countdown had been taken off their eyes. "If it was not a demonstration, the both of them would already have been put down right when the alarm went off. I made it so that they would not be killed that quickly." Jin said as he stood there commenting a little to the other two spectators.
But that warning shot was the first and last olive branch that this particular dungeon instance was giving the two Archduke Bodyguards. The next move that they made would show whether they were really up to clearing the house with that limited amount of time.
The need to be aggressive was expected given the duration of this trial but right now, Kurt and Lark need to cross the hurdle of approaching the house.