This happened for the exact reason revealed in the question. Moses' anger rose when he saw the scourging of his kinsman. He then looked this way and that before taking the action to kill the taskmaster and protect his kinsman.
kill them with vinegar
Well, according to the story, God did, through Moses.
no
Moses killed the Egyptian , as he saw that he was mistreating the Israelite slave.
I think it was just the ones who praised the other "god" the people made
As a child Moses was said to have beaten his small town Mayor to death with a rock.
Innocence and curiosity.
The widow Douglas tells Huckleberry Finn the story of Moses and the bulrushers, which is the tale of Moses being hidden in bulrushes on the Nile River to escape Pharaoh's decree to kill all Hebrew male babies. It is a story of faith, courage, and deliverance.
Moses
It isn't known who killed Sihon, but it was in battle.
If you mean the Israelites exodus from Egypt. The Koran did mention their flight from Egypt to the holly land in Great detail. As such Muslims do believe this story. The story in Koran describes how the Pharaoh wanted to kill Moses and his followers. Yet, God instructed Mosa to flee Egypt with the Jewish Community and Moses Split the sea and they were saved. It also describes how the Israelites left the will of god (by worshiping a status of a golden bull while Moses was receiving the Torah) and as such they were punished by 40 years of being lost in the desert... As you may note the stories are almost identical
Moses killed the Egyptian before god called him to lead the people, to the promised land.