Först och främst tvingar han inte tvärsöver dem, strängt taget.
Affären var för honom att hjälpa trioen bryta sig in i Lestrange valv - INTE för att hjälpa dem att komma tillbaka.
Griphook DID få dem hela vägen in i valvet så att han uppfyllde bokstaven i hans fynd 100%.
Han gjorde till och med mer än fyndet och hjälpte dem att få koppen i valvet:
It was Griphook who had seen it [sword with the cup on it] and Griphook who lunged, and in that instant Harry knew that the goblin had never expected them to keep their word.
Nu kanske du undrar varför han inte gick utöver och hjälpte dem att komma ut som inte var en del av köpet. För det, se nästa avsnitt.
Det finns inget direkt kanonsäkerhet, men det kan enkelt utläsas:
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Bill Weasley berättade mycket för Harry om Goblin-idéer om ägande:
“Then I have to say this,” Bill went on. “If you have struck any kind of bargain with Griphook, and most particularly if that bargain involves treasure, you must be exceptionally careful. Goblin notions of ownership, payment, and repayment are not the same as human ones.
...
... However, there is a belief among some goblins, and those at Gringotts are perhaps most prone to it, that wizards cannot be trusted in matters of gold and treasure, that they have no respect for goblin ownership. -
Svärdet var ganska mycket en av de viktigaste goblinerna gjorda artefakter.
“Wizarding arrogance again! That sword was Ragnuk the First’s, taken from him by Godric Gryffindor! It is a lost treasure, a masterpiece of goblinwork! It belongs with the goblins. The sword is the price of my hire, take it or leave it!”
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Griphook hade förmodligen en inkling som Harry tänkt att hålla svärdet, åtminstone tillfälligt. Och om inte, skulle han ha ansett det vara ett naturligt drag för en trollbärare, även en något mer utvecklad som Harry.
Harry / Ron gav ganska mycket bort när han förhandlade:
“I want the sword. The sword of Godric Gryffindor.”
Harry’s spirits plummeted.
“You can’t have that,” he said. “I’m sorry.”
“Then,” said the goblin softly, “we have a problem.”
“We can give you something else,” said Ron eagerly. “I’ll bet the Lestranges have got loads of stuff, you can take your pick once we get into the vault.”
He had said the wrong thing. Griphook flushed angrily.
“I am not a thief, boy! I am not trying to procure treasures to which I have no right!”
“The sword’s ours—”Och senare - efter att ha tagit en uppenbar halvtidsavbrott för diskussion:
Hermione frowned at the floor while he was speaking; he felt irritated at her, afraid that she might give the game away.
However, Griphook had eyes for nobody but Harry.
“I have your word, Harry Potter, that you will give me the sword of Gryffindor if I help you?”
“Yes,” said Harry.
“Then shake,” said the goblin, holding out his hand.
Harry took it and shook. He wondered whether those black eyes
saw any misgivings in his own. Then Griphook relinquished him, clapped his hands together, and said, “So. We begin!”... och senare
The door of the bedroom opened and Griphook entered. Harry reached instinctively for the hilt of the sword and drew it close to him, but regretted his action at once. He could tell that the goblin had noticed.
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Såvitt Griphook gällde var detta förebyggande drag 100% logiskt och förnuftigt.