In my case, a 'focal' seizure means only part of my body is affected. I remain fully conscious during seizures. They can last for anything from about 3 minutes to 8 minutes.
Avastin is not a chemotherapy but works by starving a tumour of the blood supply for growth that it is extracting from the area close to the tumour, and is also an anti-inflammatory. It cannot kill the tumour and when the treatment stops then the effect is usually a sharp reinvigoration of the tumour.
At the same time it can have bad side effects [immediate stroke, coronary, etc] and sliding into low quality of life, if any life at all. But in my case, initially combining two therapies [i.e., chemotherapy and Avastin, for which there is evidence of a good result] and taking some control could turn weeks into months of reasonable quality of life.