The unexpected stab makes him buck with surprised pain and another sharp "Fuck-!", and the injection hurts being forced into him, and a terrified dread sets in as the numbness begins to spread, as his racing heart makes it worse. As his breathing slows, with the foreign exhaustion under his skin, as he loses the battle to keep his eyes open and his head upright, and his consciousness flags as he slumps heavily into the chair, stripped of all fight.