Knicks coach Derek Fisher is involved in an altercation with Matt Barnes in Los Angeles throughout the weekend, and the matter is at present being researched by NBA officials, as indicated by a man acquainted with the circumstance. Fisher was at a blaze on Saturday with television personality Gloria Govan Barnes’ Ex-wife, whom Fisher is purportedly dating at Govan and Barnes’ home. Barnes apparently drove almost 100 miles from Grizzlies’ training camp in Santa Barbara to stand up to Fisher. Two or three individuals at Govan’s house mediated to prevent Barnes from hitting Fisher, as indicated by a different report.…