| beowulf99 |
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CRB PG. 474 "Size, Space and Reach" wrote:
The Space entry lists how many feet on a side a creature’s
space is, so a Large creature fills a 10-foot-by-10-foot
space (4 squares on the grid). Sometimes part of a creature
extends beyond its space, such as if a giant octopus is
grabbing you with its tentacles. In that case, the GM will
usually allow attacking the extended portion, even if you
can’t reach the main creature. A Small or larger creature or
object takes up at least 1 square on a grid, and creatures
of these sizes can’t usually share spaces except in situations
like a character riding a mount. Rules for moving through
other creatures’ spaces appear below.
I believe this is the relevant section.
You can also look at the Boggard type creatures who have special rules for severing their tongues and cludge something together for a similar effect in your game. But I would probably just allow the grabbed creature to attack the main creature in an instance like the one you described.