I always wondered about this scene
Did fring kill victor cause he was trying to cook? I think he had it in his mind to kill either Jessie or Walt but Victor rubbed him the wrong way
He killed him because he ran up in the crime scene (when Gale got shot) and mad people seen him. When Mike asked him "were you seen?" and Victor said "yeah, so what?" you could see Mike's expression change like
Also when the DEA called Fring in to question him they had Victor's face on the wall, remember? They were looking for him because of that.
Fred.