Maxperson
Morkus from Orkus
But, again, reasonable and within the rules doesn't really matter. The reason we keep it that way is because it makes it more believable and thus, more fun. 83 knights dying to some overly amorous deer would be unbelievably and no fun. But, the presence of that small family of dragons (or, I believe the actual example was giants) is an entirely arbitrary decision. At no point were any actual mechanics USED.
If the encounter mechanics say that giants or a small family of dragons is possible to encounter in an area, then I am using those mechanics if I choose giants to have killed the knights.