"Some Momentum spends are not tied to a specific test
and can be used freely as soon as they are required, spending
points directly from the group’s Momentum pool rather
than waiting for a successful skill test. These spends are
referred to as Immediate…
…During any successful skill test, a character may spend
Momentum saved in the group Momentum pool instead of
or in addition to any points generated from the successful
skill test itself, spending from either or both as desired."
Do you mean this on page 118
“Momentum is a key tactical resource during Action Scenes.
When a character generates Momentum in an action scene,
numerous options are available by which the character
can overcome enemies, empower allies, and bolster the
effectiveness of actions.”
I think that’s more explanation than an actual rule. The rule book doesn’t differentiate between actual rules and explanation or fluff though so it’s hard to tell.
I would certainly play you can use group Momentum for in combat.
They do not gain Doom when you spend group Momentum. What rule gives you that idea?