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When a member of the pack dies its strength is transmitted to the remaining members of the pack. Each pack-mate that receives such strength increases its damage die by one size, up to d10. If a pack-mate with maximum-sized damage dice receives more strength give it an additional die of the same size and take the best result, or give it +1 armor, or heal it of all damage, your choice.
When the striges have drunk of your blood, at the end of the encounter you will need to bind your wounds and take steps against infection. If you do, roll+CON. On a 7-9, eventual sickness. On a miss, the bleeding just won't stop!