Question on shared damage

So if an opponent has a hero with 1hp left, and I match 3 tiles into it, all 3 will register damage even if it wouldve only taken 1 tile to kill.

Now if i use shared damage (ex. wilbur), and opponent has 2 heroes left, one with 1hp and the other with sigificantly more, and I match 3 tiles into the one with 1hp, only the 1st tile damage will be shared, but the damage of the 2 other tiles will register on the hero with 1hp.

Question: shouldnt the damage of the 2 “overkill” tiles also be shared?

In these shots, despite needing only 1 tile to kill, all 3 hits are registered.

Here, only 1 tile is needed to kill the wolf, but 3 hits register. However, only the 1st tile damage is shared while the other 2… fizzle?