[@Geraven]

[i]Knave frowned like a child, bottom lip stuck out, dropping all pretenses of friendliness when he saw he couldn't trick the man into talking.[/i]

"Such nerve... Trying to kill me for my treasure? Not even trying to make up for it by telling me secrets, even after you got to find out about my great stealth power? I found the treasure, not you. Fine, be like that..."

*Another beat, this one a little awkward*

"Yes, it was very pretty in there."

[i]At this point, Gren might find himself abruptly thrust into the next life, and wondering what the fuck had just happened. He'd been able to sense Knave's presence popping up from behind due to the mana inherent to the fellows magical items, but that had been after Knave had stopped, Gren having then the fraction of a second he needed to register the ether. He'd not know if Knave had teleported, ghosted, or even as the man had misleadingly stated, used 'stealth power'. 
Gren likely felt he could activate and rely on his bullet time, ability to detect hostile intent, and ether sense in either scenario. The hostile intent was there all right, this freak meant to end him. The Knave had once killed a wounded farmer with a hoe simply because the man had carelessly trampled a few potatoes, after all. At the moment, Knave was in a similar state of mind. Enchanted items were usually phenomenally durable, at least the ones worth having. He'd pluck them out of the mess afterward, if they were strong enough to have survived.

The instant Knave finished talking, he took a step forwards. A step that, the moment his foot began moving, propelled him forwards nearly 50% faster than the Juno space probe. The acceleration was immediate, the speed was so intense that the leaves of every tree within a tenth of a mile were shredded and the bark stripped like cheap paint. The very air filled with blue friction fire, and the ground behind him exploded as if Knave had stepped on a landmine with a payload the size of Trump's MOAB. If Gren at all tried anything before Knave, either with words or a visible power, the seven league step would be the instant rebuttle.

Gren could, at base power, react to things around 1/1,000 of a second, roughly. Knave was set to hit him in less than 1/20,000 of a second, and with no warning. Gren's brain couldn't process the assault in time to use a flash step, which would've likely been far slower than Knave anyways and required one to know where they want to end up, more time devoted to conscious thought. Even if he could have seen it coming with his lightning aura, He'd not have any time at all to activate it, let alone percieve the attack coming. His power to detect hostility let him know about harmful intent, but not the nature or potency of the attack, and probably not the exact moment the intent would be acted upon unless the enemy had at that moment decided to act on impulse over calculation resulting in a shift in the magnitude of their blood lust. Knave had been out to kill in cold blood from the moment he lost his treasure, with about the same attitude a man takes with him to gas a beehive after being stung.

As for the possibility of Gren surviving if he got hit, it was, well, nil. He could lift eight tons easily, but presumably couldn't endure more than fifty times that at base power. Knave, meanwhile, was a 150 pound projectile traveling at over mach 300, generating at least 70,000 psi from air pressure alone. Suffice to say, if Gren got hit, which he likely was going to be...

He'd be gibbed into hamburger so hard that the cave ruins behind him would've been sheeted in his pureed viscera, if they hadn't been blown to dust by the shock wave first. Knave could move through that air pressure as if it were a gentle breeze, such was his magically amped strength and toughness. In short, The Knave tried to walk through Gren as though he were made of rice paper.[/i]