I remember someone saying that Flash Reincarnations 2 damage is counted as damage dealt by your general. I tested it in sandbox, and Flashing out a minion when you have Morin Khur equipped DOES hatch any eggs that you have. I am in agreement with everyone that Eggmar still needs some more support before it becomes a competitive archetype, but anyone trying to experiment should definitely remember this interaction. This makes it possible to double hatch a minion. If you have a Veteran Silithar on board, that is 12 damage burst not including your general attack. Also could be useful if your opponent is running away and you have nothing to smack.
I assume that Twin Fang would be the same but I only have 1 copy and it didn’t come up quickly enough when I was testing in Sandbox mode. It is worded the same so I don’t see any reason why it would not.