Guild Wars 2

can you reflect engineer grenade?

can you reflect engineer motor?

You can, although they can be a bit difficult to reflect due to the ground targeted nature of the abilities. The actual projectile attacks will have to collide with the reflective ability at the correct position and angle, or else it may just hit the ground beside it.

Even if the grenades and mortars are reflected, they may or may not be reflected back in a direction that will reliably hit the enemy throwing or shooting them.

So in short, you can, but it’s not a reliable way to counter them.

Can’t remember having this happen to me, but wouldn’t a Mesmer’s Feedback on the Engineer blast all the grenades on the Engi’s hands/paws?

It’s a very specific way to counter it and only available to one class, but at least it might force the Engi to move or stop attacking.

Yes and yes, but it usually doesn’t matter. In PvP you should be moving around anyways so it’s easy to get around or walk through the reflect. Otherwise you can throw/shoot at the base of the reflect and hit them with the AOE explosion. Reflect is not a meaningful counter to nades or mortar.