O Stirge não faz nada além de dano contínuo ao seu alvo enquanto ele tem seu alvo agarrado.
O Stirge atualizado DDI do Cofre de Monstros esclarece isso.
O ataque Mordida do MM Strige diz:
+6 vs. AC; 1d4 damage, and the target is grabbed (until escape) and takes ongoing 5 damage until it escapes. An attached stirge doesn’t make attack rolls while grabbing a target and gains a +5 bonus to its AC and Reflex defenses.
Anexa Mordida do Cofre da Monster lê:
Requirement: The stirge must not be grabbing a creature.
Attack: Melee 1 (one creature); +6 vs. AC
Hit: 1d4 + 5 damage, and the stirge grabs the target (escape DC 12). Until the grab ends, the target takes ongoing 5 damage.
E uma característica é adicionada, indicando:
While the stirge has a creature grabbed, the stirge gains a +5 bonus to AC and Reflex