>>71069613People first speculated the hit Toriyama was a clot that moved from a benign place and clogged an artery, causing an CVA. We now know he had a tumor and the last moth he had surgery over it.
When someone hits their head they are evaluated at first with the Glasgow scale to determine how lucid they are, the less lucid the more obvious the damage is. Cerebral damage symptoms are pretty acute, not to mention that it's critical what side of heat was hit. But overall, if someone is capable to speak, stand up, walk, recognize themselves, others, the time, and place they are right after the accident and minutes to the hour well past it, there is little to nonexistent risk of real harm.
At worst, Zeta might get a swollen spot on her head or maybe some tearing in the scalp that might need stitches.