Friso94

Question: John puts a grenade on a fork lift and wheels it over to the bold, shirtless, muscular guy shooting at them. It explodes big and almost water like. What kind of bomb/grenade was that? (01:21:10)

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Chosen answer: It was a normal hand grenade but they shot a few gas lines earlier in the shootout, which caused your mentioned "water-effect".

Friso94

Question: Is John McClane ambidextrous? I noticed in several scenes, he'd alternate between using and holding his gun with his right and left hand.

Quantom X

Chosen answer: No. Bruce Willis (and thus, John McClane) is left handed. But guns are mostly designed for right handed people, so when he isn't holding a gun modified for him, it's easier to use it with his right hand.

Friso94

Chosen answer: The ring road around the center of Moscow.

Friso94