It is maybe a Bug. But if you have a Situation like revoker with disruptors, they make damage. (Damage radius)

Or the surge have freez you a mikrosecond befor the Barricade wass there.

Blockhorn barricade isn't solid, it has gaps, so if you aim right (which is really difficult) most weapons will go through it. I think it is mentioned in the official highlight video of the Blockhorn mech, but may be wrong.

Use Panther, his abillity can't be brocken.

Maybe he can't  take it with a surge, but his ability is länger, so you can shoot länger with snipers or gravitation beam on a surge.

You are right but the only issue with this is Panther doesn't get 60% damage bonus with his shield, which isn't negligible.

I have Blockhorn and but not Panther. And in Hangar Showdown no choice.

Yeah in Hangar showndown of course not. But in Cpc or in 5v5 panther is better than blockhorn. ( I have them) and I only play panther. My ingame Name is (conen)

So blockhorn's ability is supposed to stop emps and the like, which it generally does.

The issue I think is 1. ping, as someone could've shot you fatally with revoker before you put the barrier down on their end, and so they appear to kill you through said barrier on your end, and 2. the barrier has physics collision, which seems to cause some weird desyncs between players at times, especially with bots.

All damage with barrier standing not before.

Sometimes barricade stops effects sometimes not. Maybe bots have Neo's power. 

Well, also, revoker has a secondary damage mechanic where the projectile stays in the target for a short moment and then leaves, doing more damage.

Also, the barrier can be placed on your screen but not on their own, again allowing them to seemingly shoot through it