Maybe, but let the laser pointer aim at an incoming missile flying at Mach 3 or higher and actually hit the seeker. That might be less than 6 inches, which is tricky. You can try to "re-designate" a target on the ground by pointing the laser away from the target. But this also needs to be done as soon as possible. And the missile is very smart. It "expects" to see the target near the original launch target. If you reflect the laser pointer through a single point multiple times, will the energy of the intersection point be higher? Trouble! Unless some form of magnification is used. Otherwise, the emitted light reflected back to itself will never exceed the initial input power. This will involve additional energy input. This sounds reasonable. But you are looking for positive, additional feedback, which requires additional energy to maintain.
The principle of the laser pointer is. You must continuously increase the power at the right moment. To amplify the output. Consider an analogy with a microphone and speakers. Unless there is a power amplifier in between, you will not be able to get feedback. Even so, the microphone and speaker must be at an appropriate distance to be in phase and provide an additive signal. Move the microphone to the out-of-phase position and the feedback stops! Well, run at this frequency anyway. Then move to another state where you inadvertently enter the phase. I wish you a potential fellow traveler.