Harry had not called because Voldemort had shown up at his door with a wand.
But it was not far off from that.
After hanging up, Su Er went upstairs to his bedroom, sat at his desk for a while, spread out some parchment, uncapped his fountain pen, and wrote a line-
"Dear Professor Dumbledore, Harry called from the Dursley family's house and said that the scar Voldemort left him had started hurting again. I believe it is necessary to inform you of this."
After writing "this," however, Su Er did not continue. Instead, he put down his pen, gently rubbed his brow, crumpled up the paper with its single line of writing, and tossed it into the wastepaper basket. Taking a deep breath, he pulled open a drawer.
This concerned the local bully Voldemort, and whether he could enjoy a happy, blissful, shameless future with Hermione. He had better go to Harry first and find out what was happening.
Then he would write to Dumbledore and ask the old man to step in. Having someone powerful to rely on but keeping things to himself and dealing with them alone-to put it in Professor Snape's words, Su Er did not believe his head was full of flobberworms.
According to Harry, he had had the dream last night. If Su Er went to see Harry early, got the details, and informed Dumbledore by owl so the old man could turn up promptly with the Elder Wand, perhaps...
With that thought, Su Er made his decision. He took some money from the drawer, went downstairs, told Mrs. Ellison, and left. No, do not misunderstand-not Galleons, but pounds. After all, taxi drivers did not accept Galleons.
As for Galleons, those could be used to ride the Knight Bus.
*I! Su Er Bones Ellison!