In an attempt to stop the attack, Zhang said that he "...bit the panda on its back but its fur was too thick." Zoo officials sedated Gu Gu by spraying him with water. Zhang was hospitalized after the incident.
To stop the attack, Zhang bit the panda on its back, but the panda's thick fur made it difficult to bite through.  Zoo officials sedated Gu Gu using water spray and Zhang ended up in the hospital after the incident.