But this is exactly [MENTION=57948]triqui[/MENTION] and [MENTION=52548]Aaron[/MENTION]'s point (as I read them): that in D&D 3E (at least - maybe other versions as well) fighting a T-rex or a dragon can involve being picked up by it in its jaws, being crushed by its jaws or its body, etc. Which entail "automatic severe harm" just as much as does falling 100 feet.There is nothing implicit that suggest severe harm is automatic when you say "teleport", "be in a sword fight", "battle a t-rex".
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In RPGs fighting T-rex is just a glorified sword fight.
And hence that, whatever story you tell about your mojo that let's you survive those things ("I wedge it's jaw open with my sword"; "I use my shield to create a little pocket where I survive under the crushing bulk of the dragon") you also tell to explain how you survive the fall ("At the last minute, I use my cloak (which is probably as magical as my sword and shield) like a parachute, Batman-style").
Also, when you say "in RPGs fighting T-rex is just a glorified sword fight", you presumably mean "in D&D". There are plenty of fantasy RPGs in which fighting a T-rex is not a glorified sword fight - in which a T-rex is modelled so as to do damage that a PC can't take, or to pierce armour/DR in a way that a sword can't match, etc. In which, in effect, if the T-rex actually gets to bite you, let alone grab you, then you're dead.