When stuck to a Floodcarrier, what causes a C4 to immediately detonate (regardless of the timer setting) when the Floodcarrier pops?

Material Effects maybe?

Only way I could currently think of is to give the C4 a collision geometry which has the same amount of health as the damage the explosion of the carrier form does. However, with this method, you can shoot the C4 enough times and it would detonate.

Probably the same mechanic that makes grenades on the floor explode when one near them does.

Mythril,
I should clarify my post by saying that, it does this already without any modification. I accidentally discovered this effect by attaching a C4 to a Floodcarrier's back with a 99 second fuse, and shot at it with a shotgun, and it immediately exploded when the FC popped open.

im not sure if this is right, but my guess is that once the c4 is stuck to the carrier form, it becomes a child of the carrier form, and the children of the carrier form die when the "object" (in this case, carrier form) die, therefore exploding.

again, just a guess

I was going to say that too. Yeah, any object attached to another object becomes a "child" of the object, basically becoming part of it.

Since the carrier form's death is an explosion, the actual carrier form object gets destroyed in the explosion, and all that's left is the explosion effect and the little infection dudes running around.

Because the carrier form object is destroyed, the C4 has to be destroyed too, since its now a part of the carrier form. And just like the carrier form does, it blows up.

It's pretty funny when you stick a portable nuke on the Carrier...you must run for your life, as well as everybody else!

Oh wow, learn something new everyday.

@Mysterion: I misread the first question, I thought you wanted to make the C4 explode when the flood carrier explodes, not find out why it does that.