Discussing the dramatic sequences which lead up to the final confrontation between Harry Potter and Lord Voldemort, Grint told Empire that the battle would look "amazing" on screen.
"The way we filmed it was confusing, because we filmed both parts simultaneously. So some days we'd be doing a Part One scene, then a huge battle," he explained. "It was quite hard to keep track of what was going on in Part Two, so I'll be quite interested to see how it's all been put together.
"But the battle sequences are great, I think. It was just so big and epic; there was one scene in the courtyard where it's one big, continuous shot and they have five cameras picking up everything, and there's giants and fire and big craters."
He continued: "Even for Harry Potter it felt really huge. These sets, they did actually destroy them. The rubble you see is actually the set falling apart. It's quite weird seeing all these sets that I've grown up in as piles of rubble, there's something strange about that. But it's going to be amazing."
On seeing the familiar sets destroyed, Grint confessed that the filming "really nailed down" that the series was coming to an end.
"Seeing the Great Hall... The place had become quite a familiar one in our lives; we'd spent a lot of time there. And now it's on fire," he remarked. "There are dead bodies, dead children everywhere. It's really dark."
> 'Harry Potter' battle 'ties to character, emotion'
Watch the trailer for Harry Potter and the Deathly Hallows: Part Two, which opens in cinemas in the UK and US on July 15, below: