My current theory is that there is a block on Death coming here - we had a situation once on the Disc where Death had literally, um, gone on holiday, and didn't turn up to collect the soul of a wizard, and so, he carried on living. In this sense, Death is barred from entering the Barge, so nobody dies, just suffers mortal injuries. There's no fully corpereal and conscious resurrection; something which would require a very, very powerful wizard, if not sourcerer to do, it's more likely that there is magic preventing Death from entering. I 'died', and didn't meet Death at all - I also, as a wizard, should be able to see my death coming, and didn't see it coming.

Of course, the only way to truly work that one out is to try summoning Him.