"But if you betray me," he said, "if you fail to do as I direct you—" (9.71)
The Invisible Man is not a very trusting individual. As soon as he gets a partner, he starts talking about betrayal. It's almost as if the Invisible Man <em>expects</em> people to turn against him. Why might this be?
The Invisible Man appeared to be regarding Kemp. "Because I've a particular objection to being caught by my fellow-men," he said slowly […]
"Fool that I am!" said the Invisible Man, striking the table smartly. "I've put the idea into your head." (17.97, 99)
When the Invisible Man calls the people who would catch him "my fellow-men," he seems to recognize some common quality between him and the people around him – even those he worries will betray him.
"It occurred to me that the radiators, if they fell into the hands of some acute well-educated person, would give me away too much, and watching my opportunity, I came into the room and tilted one of the little dynamos off its fellow on which it was standing, and smashed both apparatus." (20.52)
The Invisible Man worries that his equipment will betray him. That is, he worries that these radiators will tell his secret. There's some irony here because Griffin is telling this story to Kemp, who <em>will </em>tell Griffin's secrets. Notice also that Griffin's solution here is violence, which will also be his solution when it comes to Kemp. We're seeing a trend here.
"So last January, with the beginning of a snowstorm in the air about me—and if it settled on me it would betray me!—weary, cold, painful, inexpressibly wretched, and still but half convinced of my invisible quality, I began this new life to which I am committed. I had no refuge, no appliances, no human being in the world in whom I could confide." (22.1)
Again, betrayal is connected to isolation. Griffin can't confide in any human being, and now, even the snow could betray him. Seem a little – or a lot – paranoid? Absolutely. That's probably why the movie versions of Griffin tend to show him as clinically insane.
"Not wanton killing, but a judicious slaying. The point is, they know there is an Invisible Man—as well as we know there is an Invisible Man. And that Invisible Man, Kemp, must now establish a Reign of Terror. Yes; no doubt it's startling. But I mean it. A Reign of Terror. He must take some town like your Burdock and terrify and dominate it. He must issue his orders. He can do that in a thousand ways—scraps of paper thrust under doors would suffice. And all who disobey his orders he must kill, and kill all who would defend them." (24.28)
What's the point of violence? For the Invisible Man, it seems like violence is often just a hobby or a fun activity. Here, though, he lays out a plan. He'll only use violence in order to get what he wants. In other words, violence here is a source of power.
"The fact is, I'm all here—head, hands, legs, and all the rest of it, but it happens I'm invisible. It's a confounded nuisance, but I am. That's no reason why I should be poked to pieces by every stupid bumpkin in Iping, is it?" (7.50)
The Invisible Man is being attacked by the people of Iping and has just agreed to surrender to the police. (Turns out he's lying, by the way, which also shows us a lot about him.) When he finally reveals his identity, he also takes the opportunity to distance himself even more from the villagers by calling them bumpkins. This guy <em>really</em> doesn't want to make friends.