
Orfamay Quest |

Right so is Bob considered a flying creature if he's consumed a potion of fly and is standing on the ground?
Nope.
What is a flying creature? One that has a fly speed? Do you need to actually be flying to qualify for the - cannot be tripped - part?
Yes, a flying creature is a creature that is flying.
Think about what a "trip" entails. You're removing a support from an object and therefore causing it to topple over. Flying creatures have no support to be removed, therefore cannot be tripped. (Flying creatures that use wings can, in fact, be forced to the ground by interfering with their wings, as per the rules for paralysis: "A winged creature flying in the air at the time that it is paralyzed cannot flap its wings and falls.")

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I'm gonna say "can fly" is different than "flying."
Now since a creature capable of flight doesn't use their legs to propel themselves(generally), I'd allow a flight-capable creature to 5 foot step away while prone and "stand up" at the same time by flying. Basically I see it as you can't be prone and flying the same time so if you start flying you lose prone.

Bjørn Røyrvik |
I'd say you need to actually be flying to avoid being tripped. It's the only way that makes sense.
I've been toying with an idea to allow limited trips against creatures with air-displacement based flight. So it wouldn't work against creatures with a Fly spell or ghosts or anything, but you can mess up a winged creatures flapping somehow. If a winged creature is tripped in flight it falls at half normal falling speed. If it doesn't hit the ground before its turn, it can make a DC 10 Fly check to regain control.

Orfamay Quest |

I'd say you need to actually be flying to avoid being tripped. It's the only way that makes sense.
I've been toying with an idea to allow limited trips against creatures with air-displacement based flight. So it wouldn't work against creatures with a Fly spell or ghosts or anything, but you can mess up a winged creatures flapping somehow. If a winged creature is tripped in flight it falls at half normal falling speed. If it doesn't hit the ground before its turn, it can make a DC 10 Fly check to regain control.
That sounds like a very useful feat.

SlimGauge |

My house rule would be that being "tripped" while flying would, for a creature that depends on wings for flight, count as "being attacked while flying" per the fly skill rules, with an increase of +1 to the DC of the resulting fly check for the amount that the combat maneuver check succeeded by.
So if you got exactly the value you need to trip this hypothetical flying creature, he'd need a DC10 check to avoid dropping 10 feet (remember the modifiers for maneuverability and size). If you beat him by 5, it's DC15. You beat him by 20, it's DC30. Etc.
Basically, you forced him to do a barrel roll and in doing so, he's forced to lose a bit of altitude.
If Bob was using that magic item that lets you fly with wings and was only 5 or 10 feet in the air and blew the fly check, splat and he's prone on the ground.