Shin Okada
Explorer
Say, a PC gains fly speed somehow for a short time and grabbed a flying monster. When he lost his fly speed, shall he fall down and release the monster?
I don´t know what RAW says, but it doesn´t matter.
Of course: grabbing a larger flying creature will be page 42.It kinda matters, but yeah, this is one place where to an extent DME trumps RAW.
The rules limit you to grabbing creatures no larger than one size larger than you. As such, it's fine to let you immobilize the creature you've grabbed even if it's flying -- but I'd give the grabber an option -not- to immobilize the target if they wanted it (eg, "no, I don't want to fall pummetting from the sky").
Obvously, if you grab onto a creature larger than that (flying or not), you don't get to immobolize it and you're firmly in page 42 territory (and you're not "Grabbing"; just grabbing). If you can hack at the dragon while defending against it trying to shake you off its back, though, more power to you.
The scenario you described wouldn't happen. Unless you have hover, Flying prevents you from taking opportunity actions. If you are affected by any condition that prevents you from taking opportunity actions, the grab ends instantly. So you'd roll your grab attack, succeed, and then it'd end instantly.
Um, OK? But that wasn't the situation described, so.... what was your point exactly? Further unless an effect says you can end it, you can't. So unless you meant that you stop flying as a free action, in which case you crash (fall your fly speed to the ground). Since you're moving away from the creature, the grab ends. The most generous interpretation you might be able to use a move action to force the grabbed creature to move with you to the ground (that would be a Rule of Cool ruling however and not strictly RAW).There are plenty of cases where it works:
1. Grabbing a flying creature while you're on the ground and it's in reach. This works, assuming it's small enough.
2. There are plenty of abilities that give players temporary flight with hover. To start with, Genasi can take Stormrider and get hover whenever they're flying. Storm Sorcerers can use Thundering Gust to gain a fly speed with Hover starting with level 3. Wardens can use Form of the Vengeful Storm (which will end when they use a different power) at level 9. Avengers can get Fly 7 (hover) for two turns at level 10. And then there are paragon paths.
Moreover, while -flying- without hover doesn't let you make opportunity attacks, -falling- doesn't prevent you from making oppy attacks. So if you're willing to grab onto a target until both of you hit the ground, well...
Also, arguably, you can grab a target while flying and then -stop- flying as a free action.
UngeheuerLich: Absolutely. Grabbing a creature more than 1 larger than you (flying or not) is a page 42 action.
Unless you are holding onto a surface you can hold onto or rest upon (from the example given it is obvious "hold onto" applies to walls etc), you crash when you stop flying. That is the exact rule. If you want to categorize an enemy as a "surface", then you don't fall and the grab sustains, with the grabbed target immobilized in his current square.I don't believe there's any rule that requires you to fall if you're holding onto something. Whether that something is a rope, cliff edge, or dragon. Or if you're mounted on a wyvern for that matter.
Now, if that (rope, cliff edge, or dragon) is unable to sustain your weight... then down they go, no problem. But there's no forced or chosen movement away from the target when the fly ends, so as far as I can see the grab is still in effect.