There is the total invisibility available on Jamie's shields, and the perfect disguise available to Irik's people. The disguise is just that, not true invisibility. It uses visible light to cause the user to blend with all surroundings, from any angle. It is a disguise that fools the eye, not invisibility. It's why Jamie and the others could see Irik when they used the 'heat' modification to the shields to look about them in the Infrared.
The invisibility feature of Jamie's shielding actually does pass the visible spectrum around the circumference of the shield in every direction, providing true invisibility. But normal light is not coherent light. Laser light is a different animal.
Even a very powerful laser beam does not carry much kinetic energy. What happens when a very powerful laser strikes a solid object is a rapid ablation of the surface of the target, an exploding outward of the material struck, itself, which converts the energy of the strike into kinetic energy, as the explosive force opposes the direction of the strike. So you can bash things around with a very powerful laser, but it's not due to any (or much) kinetic energy inherent in the beam. It's caused by a reaction in the target, itself.
A strike against a barrier like Jamie's shield results in a rebound effect similar to a strike against solid matter, as the shield is forced to deflect the energy of the strike. As the blue lance is too powerful to be countered by focusing all resistance at the point of impact without causing the shield to fail, the shield tries to distribute the strike to every part of it's surface. This process is less efficient on the back side of the shield than on the side taking the strike, causing the shield itself to rebound back away from the strike. At the power levels of the blue lance, the rebound is sufficiently violent to injure someone within the shielding.
That's my story, and I am sticking to it!