Quote 1
The other snarled aloud into a savage laugh; and the next moment, with extraordinary quickness, he had unlocked the door and disappeared into the house. (2.36)
Mr. Hyde’s default personality is one of violent savagery.
Quote 2
Instantly the spirit of hell awoke in me and raged. With a transport of glee, I mauled the unresisting body, tasting delight from every blow; and it was not till weariness had begun to succeed, that I was suddenly, in the top fit of my delirium, struck through the heart by a cold thrill of terror. A mist dispersed; I saw my life to be forfeit; and fled from the scene of these excesses, at once glorying and trembling, my lust of evil gratified and stimulated, my love of life screwed to the topmost peg. (10.19)
Mr. Hyde (or Dr. Jekyll) derives enormous pleasure from extremely violent acts.
Quote 3
Once a woman spoke to him, offering, I think, a box of lights. He smote her in the face, and she fled. (10.24)
Mr. Hyde is violent even to people who are perfectly civil.