Missed the gene Life() call.

code/modules/mob/living/carbon/human/life.dm

@@ -220,12 +220,13 @@
 			if((COLD_RESISTANCE in mutations) || (prob(1)))
 				heal_organ_damage(0,1)
 
-		if ((HULK in mutations) && health <= 25)
-			mutations.Remove(HULK)
-			update_mutations()		//update our mutation overlays
-			src << "\red You suddenly feel very weak."
-			Weaken(3)
-			emote("collapse")
+		// DNA2 - Gene processing.
+		// The HULK stuff that was here is now in the hulk gene.
+		for(var/datum/dna/gene/gene in dna_genes)
+			if(!gene.block)
+				continue
+			if(gene.is_active(src))
+				gene.OnMobLife(src)
 
 		if (radiation)
 			if (radiation > 100)