It's a fantasy role-playing game.

DM: You are Vex Vex'ahlia, a half-elf ranger . You are the member of the famous group of adventurers. Previously, She finds the pond from her vision after about 40 minutes of travel, identifies the footprints of the creature, and stealths after it. In a glade, after following the footprints for a while, you finds that the trail has gone cold.
DM: That is 28 points of slashing damage, and then it's going to attempt to bite you. You watch now this snub crocodile-like jaw unhinges and opens up with these natural spiked teeth on the top and bottom sides. It's going to reach out towards you. That is a 15.
Player: That doesn't hit me.
DM: It goes to bite towards you, and after the first strikes hit you, you duck out of the way and you hear him snatch together over top, making a horrible clenching noise, but you are not in the jaws when they close. As you look up as you duck down, it pulls back and (snorts) in a "what have you got?"-type expression. What are you doing?
Player: Okay, I'm going to pop Trinket out.
DM: Okay, where?
Player: Behind him.
DM: You watch this tiny arc of black energy arc over and you swear you see two of the eyes, even though there is no visible iris, follow the immediate motion as the rest stay focused on you, and then Trinket appears behind it. (roars)
Player: I'm going to disengage.
DM: Okay, as your bonus.
Player: And bamf up into the sky on my broom.
DM: All righty. How high up are you going? Full movement?
Player: What is that, 30?
DM: That is 30, yes.
Player: Yeah, but I want to get up to a tree that's far away from him. I don't want to hang out on the broom, I just want to be high enough that he can't jump up to me right away. You know what I mean?
DM: Yep, so you are right up there.
Player: Okay, and then I want to brace myself in a tree, so if I fell off the broom I wouldn't fall onto the ground.
DM: So full movement would be about 20 feet up and ten feet back?
Player: Yeah, sure.
DM: Okay, so you would be about there, and you would be a little bit lower. We'll say for the purposes of this, because that direction does matter. All right, so you're back over here. Got it. Right up against this tree. That's your bonus action, that's your movement, what else are you doing?
