A brain-injured Buffalo firefighter who unexpectedly started speaking again on Saturday after almost a decade of silence has continued to have bursts of conversation since then, but he has not been as animated, his family said yesterday. Hearing the firefighter, Donald Herbert, speak was "completely overwhelming," his wife, Linda, said yesterday. "We are still trying to cope with this incredible experience." His doctor said the breakthrough - 14 hours that began when Mr. Herbert suddenly regained consciousness and asked for his wife - came three months after his medicine was changed. The doctor, Jamil Ahmed, said that he had figured...