problems with particle hair comb brush

problems with particle hair comb brushwen entering to particle edit mode and use the comb brush behave like it lengthening the hair and distort the strand vertex
I’m trying to report the bug but the blender developer page give me an error this happen in official 2.71 and recent build
here is an screen and blend file
/uploads/default/original/4X/c/7/0/c701f77f4f40eb282d11e94cdefb55628feae45c.pngd=1405809043&thumb=1
blend file:
boda_hair test.blend

You have already started a thread for this yesterday. Please use that instead of creating a duplicate.

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