They were almost there. It had been a long climb. The guards outside of the castle had already been dealt with. They only needed to reach the rooftop and then onto their target.
The Shogun was to die; a silent death if possible, as that was their way. Once a contract was signed, the Ninja Rabbits always finished their mission, or died an honorable death trying. The farmers in the district were tired of having their share of the carrot harvest handed over to the samurai. Once the mission was accomplished, the only sounds in the castle after their dangerous mission would be the crunching of carrots being eaten!