Every fighter is proficient with weaponry, but only a select few truly master their craft. Thus called Weapon Masters, such a warrior smoothly switches weapons and styles to take advantage of a changing battlefield. When these masters are not traveling in search of new techniques, they are often found competing against their peers, serving as trainers for a guild, or chronicling their hard-earned knowledge to aid the next generation of masters.
Being within 5ft of a hostile creature doesn't impose disadvantage on this attack roll.
You cannot use a weapon mastery if you have willingly dropped a weapon since the start of your previous turn, as the clumsy display interferes with your technique.