Tomb is just Image of a container. Something containing other things.
THen the element shows what it contains.
Resource Tomb containing Output. Some structure connected to paperwork, knowledge that contains expression. Could be Art School for example.
Officer Tomb containing Sibling. Authority containing people. Can be military school or parlament etc.
Falling in it, suggests one is dedicated much of themselves(depending what element falls) into that.
This are things happening in live every day. Nothing scary, this information is needed, so when one becomes part of a encompassing structure we can know.
In day to day, that can be entering a general store to buy products.
In month to month, joining organization etc.
Overall, its not to be avoided, it just shows specific dynamic. So far haven't seen showing that someone died, as this is very, very rare case of someone entering something encompassing. It is a possiblity, but so low, not using the whole relation for it is limiting.