I actually saw a video of it with dummies set up around a Humvee. The 'active' armour allowed for precision interception of the incoming round and initiated an explosion whose primary forces/shrapnel were directed back parallel, but opposite to the incoming projectile's velocity vector. These forces apparently were enough to virtually cancel all concussive forces and shrapnel from continuing back towards the target vehicle and personnel. Quite amazing. The video did show some concussive forces acting upon the dummies, but TOTALLY out of relation to the HUGE explosion one would expect from the combined 'active armour' and incoming projectile. While the dummies did appear to fall over from some concussive forces, they did not suffer any violent effects that one would normally encounter with such apparent energy. The announcer noted that post review of the dummies indicated on slight injurings would have occurred (minor scrapes and potential hearing damage were noted).
From the video, it appeared very similar to a multiple flare release from a modern aircraft such as a C-130, but obviously on a much smaller scale and time frame. Multiple objects popped off the target vehicle, the rather significant explosions occur and the concussive and shrapnel effects chewed the ground up 3-5m and further away from the vehicle, but within that radius suffered little effect.
Brilliant bit of engineering. But, hey, if it was so brilliant (and cost effective), it would be implemented already.