What's your view about adding new elements into a fight?
In Marvel Heroic RP, this costs dice from the Doom Pool - so the GM has to pay to add enemies.
In my 4e game, I sometimes plan waves of enemies in advance, and sometimes add them in as seems fun and sporting. This doesn't cost me any GM-side resource, but because of the XP and milestone rules for that system, there is at least a rough mechanical recognition of the greater challenge that the players (and their PCs) faced.
Because adding enemies is a transparent GM manoeuvre (and, in my case, an opportunity to poke or gently mock my players) I think it' fair game, at least in systems like 4e where the players have a great depth of resources and flexibility to respond to a GM-delivered twist.
But I can understand that others would see it differently. And there are systems where I don't think it would work, because the players don't have depth and flexibility of resources (eg low level Rolemaster, RuneQuest, non-spell user classic D&D).
I think I would only impromptu add enemies to a fight in a dramatist game where the players get
benefits from me doing so, eg when I screwed over the PCs running OGL Conan I would give them a Fate Point. I've never done this running 4e, though I agree it wouldn't necessarily feel like cheating in 4e the way it would in Classic - my Mentzer Classic game yesterday had a second wave of kobolds come in, but
(a) they were a resource drawn from the dungeon key
(b) the PCs had seen a kobold go off to get reinforcements
(c) the PCs heard them coming, prepped an ambush and massacred them.

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