How do you counter a bombshell?

[Saren]

So I've been playing a lot lately, and I've come to hate the bombshell. How on earth do you fight that thing? Short of making your own bombshell and turning it into a turtleing war, which sounds very boring to me, I don't know how to get rid of the thing. I am running into them what seems like all the time.

For example, I have just started a game on Glitch, with the other person as player one. By turn 5 they already have a bombshell sitting there with a heavy next to it and a medic behind it that I don't know how to kill. This kind of game is not fun for me. How on earth do I counter it?

I'm in Gifted, if that makes any difference. I know that this question has been asked about Peekaboo, but I'm curious about Glitch or just more general strategies.