Most of bounty hunters are selling their rewarded tokens after the tokens were traded on exchanges. Also some early ICO participants (with high bonuses) are also selling their tokens immediately. This are some problems why most of the token prices drops after the ICO.
but if in my opinion it is not right to say that the bounty hunter caused the price of the token to drop after the ICO was finished, because after the ICO was finished to distribute gifts to the bounty hunter it would not immediately be given and had to wait after investors sold the token