放手和握回去都是自由动作，武器姿势可以给剑盾双武器那种没法换手的用的
Suppose Gruntharg the barbarian carries a longspear and wears spiked gauntlets. He has a throwing axe at his belt. He encounters two orcs 60 feet away and wins initiative. For his action, Gruntharg draws the axe and moves and also readies an action to throw the axe at any orc that comes within 15 feet. The orcs charge. As soon as the first orc gets within 15 feet, Gruntharg throws the axe and kills that orc. After throwing the axe, is Gruntharg assumed to be carrying and wielding the longspear in both hands? Thus, does he get an attack of opportunity as the surviving orc passes from 10 feet away from him to 5 feet away? (Gruntharg does not possess the Monkey Grip feat from Sword and Fist.) If not, what are the rules for going from a one-handed (or carrying) grip to a two-handed grip for a weapon, and what kind of action is it to change this grip? Now suppose Gruntharg has the longspear in both hands when a spellcaster 5 feet away from him starts casting a spell. The longspear does not threaten the spellcaster because it’s a reach weapon and the spellcaster is too close. Can Gruntharg just let go of the longspear and smack the spellcaster with his spiked gauntlet? What kind of action is it to let go of a two-handed weapon with only one hand?
Gruntharg’s action in the first example (throwing the readied axe) is possible. Presumably, Gruntharg holds the longspear in one hand, perhaps letting the shaft rest on his shoulder, or perhaps just letting the butt drag on the ground. This arrangement leaves one hand free to draw the throwing axe while moving, which Gruntharg can manage because he has at least a +1 base attack bonus. (Even a 1st-level barbarian has a +1 base attack bonus.) As a general rule, if you’re big enough to wield a weapon in two hands, you can just carry it(somehow) with one hand.
The second example (an attack of opportunity against the second orc) is not possible. Holding a two-handed weapon is not the same as wielding the weapon. If Gruntharg wants to use that longspear he has been holding on his shoulder or dragging on the ground, he has to get his free hand on it. This maneuver is similar to drawing the weapon, but a little easier, since Gruntharg already has one hand on it. Therefore, it’s a free action. But Gruntharg can do this only during his own turn, and in any case, he does not threaten an area with the longspear
when he’s holding it in only one hand.
The third example (smacking the spellcaster with the gauntlet) is not possible as described. A spiked gauntlet is a melee weapon, and Gruntharg threatens the area around him with it, but only when he has that hand free. In the example, Gruntharg is holding the longspear with that hand, not wielding the gauntlet. He could indeed just let go of the longspear with one hand; this maneuver is the equivalent of dropping the weapon, even though he is still holding onto it with the other hand. Dropping a weapon is a free action, but you can use free actions only on your own turn. Gruntharg could shift the spear to one hand as a free action at the end of his turn, leaving one hand free to threaten the area around him with the spiked gauntlet, but then he would not threaten any area with the longspear
