Note:
(a) The source of 2 close-up photos in this blog is 日久-见人心
weibo.com/u/5173623942
, who on the same day (Feb 18) deleted them:
"日久-见人心 2月18日 18:55 来自 iPhone 6s Plus #武汉生活#武昌火车站因吃面引发的血案图片过于血腥已删除，谢谢"
The sources of the video and other (more distant) photos are unknown.
The news quoted in this blog are:
(i) 谢寅宗 and 周琦, 湖北武汉：一男子将面馆老板杀害，警方称系口角纠纷引发. 澎湃新闻, Feb 18, 2017 (online). www.thepaper.cn/newsDetail_forward_1621692
(ii) 武昌火车站惨案：多收三元钱，刀砍脖子断！ 武汉晚报, Feb 19, 2017.
The newspaper apparently deleted it, and neither Google nor Bing has a cache, though it is widely pirated (mostly without attribution).