iserith
Magic Wordsmith
But Bob's player did describe what he was doing. He said he was taking a deep breath and giving it all Bob's got so he could make the jump. I am not sure why that isn't enough, why Bob's player is forced to guess which precise class of actions are considered acceptable when the rules clearly state this is an intended use of an Athletics check. Simply repeating the assertion that the rules demand some particular granularity of description does not make it true.
Look at it this way: Bob's player really wants to make this jump so as not to let poor Bob get eaten by a ravening hoard of zombies. She says, "Can I use my Athletics skill proficiency to try and make the jump." In this case, the DM says, "Yes." (because the DM saying yes is almost always better than saying no). If the play fails the roll, the DM says, "Bob steels himself, takes a breath and runs for it. When his fingertips scrape on the opposite ledge before Bob plummets into unending darkness..." Alternatively if Bob succeeds on the roll, the DM says, "As Bob goes to make the jump, he finds a boulder jutting out from this edge of the chasm and using it as a launching point Bob is able to get a couple extra feet and land safely on the other side."
What's the difference? The DM said "Yes" to begin with and let the player use the things on the PC's character sheet to engage the game. Some players will automatically do what you are talking about, coming up with ideas and details all the time. Many will not, however. There is nothing wrong with engaging the game by way of the mechanics, and the DM should recognize and facilitate that player's fun just as much as the DM does with the one writing an epic by way of the table.
I thought we were done discussing, but since you brought me up, let's do this.

As an expert of what happens at my own table, I can remark on a few things going on here that wouldn't fly:
1. The player asked a question instead of declaring a goal and approach.
2. The player asked to make an ability check.
3. The DM described what the character was doing, which is the player's role.
If Bob's player offers up a reasonably specific and plausible approach by which to achieve the goal, then I can determine whether it succeeds, fails, or whether I need to see an ability check at which point I can set a DC and perhaps set the stakes. Bob's player doesn't get to say "I want to make an Athletics check to jump across," then leave it to me to describe how Bob does that. That is a complete reversal of the roles of player and DM as described in the rules. A common approach, to be sure, but better suited to previous editions of the game than this one in my view. In D&D 5e, the player describes what he or she wants to do. The DM calls for checks and narrates the results.
If Bob's player can't come up with an approach to jumping that gap and none is suggested by the other players, then perhaps there isn't one. Bob dies a horrible flesh-tearing death. No big deal. It certainly isn't the first time an adventurer was devoured by undead and it won't be the last. Next time, be more careful, Bob's player!