Lance turned red with anger but could not speak when Gavin made fun of him. "What is this idiot talking about? Doesn't he realize how precise that move was?"
And indeed, most of the Gray Clouds Sect group people thought Minos' move was accurate.
If he had kept that black hole, he would have had many transportation problems, or he would have had to use it. The second option would be problematic since they could not destroy the Saints Killing Sect, something that such a Black Hole Bomb had the capability for.
So using such an artifact against replaceable beings was the best, even though Minos' action was indeed sudden.
But even that, most of the people there could not complain. After all, given his information and the scenario he was in, Minos had to act as quickly as possible without much time to give his allies more advance warning.