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This came up in a game last night and we couldn't find a conclusive answer...it was also late.

Here's the scenario:
Ork warboss and his 4 remaining boyz charge a Trygon Prime. The Trygon is also charged by another 15 boy squad.
The Trygon challenges the warboss who accepts. Does the warboss get to count the other 15 boy squad for purposes of calculating re-rolls for moral support? Or does he only get support from his squad?

Thanks!

Any models not fighting, from memory.

As I am away from the books right now, let me post this Frequently Asked Question that poses the answer in a round about way:

Q: Two of my units are involved in a multiple combat against an
enemy unit that has been reduced to a single character. If that
character is currently fighting in a challenge with a character
from one of my two units, is it possible for my unengaged unit to
consolidate and leave the combat? (p27)
A: No, though they do count for Moral Support re-rolls.