The will of the world didn't like that he had used some of its lifespan, but it didn't dare complain to him. If he hadn't been borrowing the heart of the world at that moment and was connected to the will of the world, he wouldn't have even noticed its displeasure.
But he didn't get angry at the will of the world for being displeased with the expenditure of its lifespan. Loki was also displeased with this. He would have preferred to use his own lifespan and not have to go through the heart of the world to use the Divine Metac.
Because of this situation, he won't be able to use the Hive Mind Metac as he wanted without risking crippling the heart of the world and derailing his plans for his farm. So he didn't like this arrangement either.
Since the situation couldn't be helped, he could only say to the will of the world, "Don't worry, I will get you some of those spirit ores that can increase lifespan. If I can get some world essence, it will be even better."
