In order to keep his calm, he tried to think of a plausible course of action to get his ass (which has now registered the distinctive imprints of the flooring mat) out of this mess.
Para lograr mantener la calma, intentó pensar una acción plausible para sacar su trasero de allí (que ahora tenía las marcas distintivas de la alfombrilla del piso), lejos de ese desastre.