He saw one of the world's most venomous fish and was taking a look at it from above the surface of the water, when someone forcibly pushed his head down into the tank, causing a cleft fracture of the styloid process.
[さく, saku] (v5k, vt) (1) (裂く only) to tear; to rip up; (2) to cut up; to cleave; to cut open (esp. the abdomen); (3) (裂く only) to forcibly separate (i.e. two lovers); (4) (割く only) to spare (time, money, etc.); to use part of something; (5) (arch) (See 黥く) to have a tattoo in the corner of one's eye; (P)