Those girls actually insisted that I kept all the parts from the boss instead of claiming the horns like we had agreed on.
According to them, they could not take the parts in good conscience since they claimed that they would have definitely died there if I wasn't with them.
I did tell them that I believed the reason there were so many summons was due to the fact that there were more of us. Despite that, they still insisted on it.
Deciding that it would save me more time to just agree with them instead of arguing, I just let them do what they asked.
They then started disassembling the monster but I made Eins join them to increase the efficiency.
For this particular case, they did not protest since the boss would disappear rather quickly if there was someone waiting outside the boss room and we'll lose whatever parts we did not extract.
We finished cutting it up in record time before we headed down the stairs to the next floor.