Stirge touch attack? | EN World Tabletop RPG News & Reviews

Let me see if I'm doing this right.

Stirge attacks a PC. PC gets an attack of opportunity for the stirge entering his square (or leaving his threatened square, however you look at it).

If the stirge survives the AoO, it makes a MELEE TOUCH attack. If it hits, it deals 1d4 CON damage, no save. After it drains 4 CON points, it is full and will try to escape.

Stirge is a 1/2 CR (If I remember correctly), seemed like the Melee touch attack for 1d4 con damage was kinda powerful. My 3rd-4th level PCs were getting whooped by about 12 stirges (who attacked in waves of 4 or so at a time, not concentrated on one PC).

How would a PC free itself from an attached stirge?

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