OOC: With a near to direct hit, I suppose. The blast radius that you're describing is pretty feeble. An M67 grenade has a guaranteed kill radius of 5 metres and certainty of shrapnel injuries up to 15 metres (so proclaims Wikipedia).
Ragnar threw himself sideways as the Meta attacked, trying to avoid the blow. He didn't have anywhere near enough time to get clear properly, but he did get his head out of the way so that the blade landed on his left pauldron, one of the sturdiest parts of his armour. The blade bit into the ceramite before twisting, and shaving off a slice of it, ruining the Great Company sigil on it's face as Ragnar crashed down on his side. In response, he swept his chainsword upwards to strike the Meta directly in the stomach and groin, squeezing the throttle to its maximum extent.