UngeheuerLich
Legend
Hmmh, let me rephrase:And yet, by conceding that the party _can't_ deal with it, responses that basically act like the OP's concerns are trivial or meaningless or suggest that parties stuck in such circumstances are brainless are, well, not very useful responses.
I wouldn't throw an encounter at the party that was both supremely boring and potentially unwinnable (like a dragon who could do damage to them while they had no recourse except to run to something several minutes away)... but some DMs would just consider it a good challenge, or note that's what the random encounter table threw against the party, or just flat out not realize how bad things could be.
So it's a valid conversation to have. And it doesn't have to be just dragons. I was only giving examples of low level creatures that have flight and range 20 significant damage, since range 20 is outside of the range of a massive percentage of magic abilities.
as a DM you can always set up unwinnable encounters, even against equal level foes, or even against lower level foes, if they have favourable terrain. And for flyers, the open filds are favourite terrain.
It is your responsibility as a DM to make the encounter interesting despite it beeing nearly unwinnable. Surviving such an encounter is already a challenge and should be rewarded.
The trick is to set up a trap or hunt the Dragon down with appropriate weapons spells and rituals.
4e has an answer for many situations, but you can always break any system if you want. And the usual reaction should be creativity. And this is what makes it an RPG and not a board game...