<s>[INST] Can rolling off a pelatius ball during a gym workout cause serious damage especially if the person  hit the back of his  head against a iron clad wall edge - person got hit at the  medulla oblongata area. Did not show any visible signs for over 5 days before succumbing to an attack resembling a brain stroke. The person experienced a sense of paralysis in his left hand and leg during the workout at the gym? He managed to walk 20 minutes away from Gym and went to sit down at local juice bar before passing out. [/INST] Hi, The person whose condition is detailed above needs immediate neurological consultation. You have not mentioned if the person had any other features of brain injury like loss of memory, vomiting, loss in balance while walking, visual disturbances. It may need to be investigated thoroughly through CT scan/ MRI scan of the brain. The medulla oblongata is very much within the head and unlikely to be damaged, but other areas of the brain need to assess. Hope this helps. </s>