Explosive Weapons: Can I be stunned by a grenade blast from around a corner?
That depends on how far you are from the blast and how well-shielded you are from it. Every 90ยบ turn that the blast must traverse will halve your chance of being stunned. Simply determine the distance between you and the centre of the blast to calculate your base 1d100 chance of being stunned, then halve that chance for every right-angled turn between you and the explosion.