User blog comment:A ninja/i gots an infected idea!!!post urs too!!!/@comment-67.243.160.210-20100728205401

Its a special infected that is completely invisible and when shot it distorts and you can see a black silhouette and yellow glowing eyes, it wanders around but if it got the attention of the survivors it emits a large screech and starts attacking a random survivor, it has about 500-1000 health (depending on difficulty) and has the attack style of a fast-zombie from HL2