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This position takes the stance that opening your hand is freer-than-free. Think of it as Object Uninteraction. This position happens to be well supported by developer tweets, which have variously stated exactly that, as well as even further oddities such as Crawford stating that Clerics can cast somatic spells while holding a weapon and shield - without even needing the War Caster feat. This position also happens to be quite popular, though we should be wary that this popularity is due to players who'd love to have the benefit of a free hand regardless of their other choices. On the other hand, consider: if I were to use my Object Interaction to open a door, and in the process of opening my hand to turn the door knob, a sword happened to fall out of my hand. Too bad for the sword.

This position takes the stance that opening your hand is freer-than-free. Think of it as Object Uninteraction. This position happens to be well supported by developer tweets, which have variously stated exactly that, as well as even further oddities such as Crawford stating that Clerics can cast somatic spells while holding a weapon and shield - without even needing the War Caster feat. This position also happens to be quite popular, though we should be wary that this popularity is due to players who'd love to have the benefit of a free hand regardless of their other choices. On the other hand, consider: if I were to use my Object Interaction to open a door, and in the process of opening my hand to turn the door knob, a sword happened to fall out of my hand. Too bad for the sword.

This makes the answers to your 2nd and 3rd questions easy. You cannot perform either flourishes or Object Interaction when it is not your turn, and therefore cannot do either as part of a Reaction (unless your Reaction somehow happens during your turn). The answer to your first question is a little harder. As previous discussions [here] 1 and here show, the official rules on what requires you to use your once-per-turn Object Interaction are open to interpretation. Some people consider opening your hand to count as one of your freer-than-free flourishes while others consider it to be an Object Interaction. So you're getting two answers.

This makes the answers to your 2nd and 3rd questions easy. You cannot perform either flourishes or Object Interaction when it is not your turn, and therefore cannot do either as part of a Reaction (unless your Reaction somehow happens during your turn). The answer to your first question is a little harder. As previous discussions [here] 1 and here show, the official rules on what requires you to use your once-per-turn Object Interaction are open to interpretation. Some people consider opening your hand to count as one of your freer-than-free flourishes while others consider it to be an Object Interaction. So you're getting two answers.

This position takes the stance that opening your hand is freer-than-free. Think of it as Object Uninteraction. This position happens to be well supported by developer tweets, which have variously stated exactly that, as well as even further oddities such as Crawford stating that Clerics can cast somatic spells while holding a weapon and shield - without even needing the War Caster feat. This position also happens to be quite popular, though we should be wary that this popularity is due to players who'd love to have the benefit of a free hand regardless of their other choices. On the other hand, consider: if I were to use my Object Interaction to open a door, and in the process of opening my hand to turn the door knob, a sword happened to fall out of my hand. Too bad for the sword.

This position takes the stance that opening your hand is freer-than-free. Think of it as Object Uninteraction. This position happens to be well supported by developer tweets, which have variously stated exactly that, as well as even further oddities such as Crawford stating that Clerics can cast somatic spells while holding a weapon and shield - without even needing the War Caster feat. This position also happens to be quite popular, though we should be wary that this popularity is due to players who'd love to have the benefit of a free hand regardless of their other choices. On the other hand, consider: if I were to use my Object Interaction to open a door, and in the process of opening my hand to turn the door knob, a sword happened to fall out of my hand. Too bad for the sword.