What is better to use?

Hello, everyone!
I am newbie in MMF2 using.
I have one interesting and very important(for me)question.
Is there any way to imitate forces (like a Blast wave) that do not come through the walls and other obstacles not using active objects and fastloops?
I just can't create good top-down shooter, because i don't know how to do imitate such forces.
Thanks for advance!
P.S. I also don't know what to use for pathfinding(Pathfinding extension is hard to use). Somebody, help me please!

For the shockwave effect maybe you could adapt this to your needs somehow.

And for pathfinding, it should not be too hard because it comes with examples. Are you using the Advanced one or the regular one?

I use MMF2 Dev build 248

I meant which Pathfinding extension are you using? There are two.

I have got both extensions, but no one is easy to use. I don't use them, I just find another way to make pathfinding system.
But if you could explain me how to use that extensions - that would be great!

OK. What exactly do you not understand from the examples?

Everything, cause I am not good in english. I don't even know how can I make active object moving the needed coordinates in game level.