For no good purpose.

I warn you, I warn you of the consequences.
Once I come at my power--" He realised that to threaten thus might be a danger to himself.

He stopped.

Howard stood regarding him with a curious expression.
"I take it this is a message to the Council," said Howard.
Graham had a momentary impulse to leap upon the man, fell or stun him.

It must have shown upon his face; at any rate Howard's movement was quick.
In a second the noiseless door had closed again, and the man from the nineteenth century was alone.
For a moment he stood rigid, with clenched hands half raised.