Do you know what it is, or not?
Saying that it is "just your mind playing tricks on you to get you distracted..." implies that there is a mind separate from the "you", that this mind is owned by the "you", that this mind has a will on its own, that it is an agent, and that it is wicked. What do you mean by your statement?
Saying that it is "merely a projection of your mind..." is like saying it is merely a phenomenon, which might be true, but is not really very useful.
I think you are just being a little too pedantic and over intellectualising what I have said. Ryu understood the point of my statement, ie it proved useful, which is not to get distracted by sensations. That is one of the key points of awareness meditation. Merely to be aware and not to enter into analysis and judgement of sensations/thoughts.
When I was doing long sessions of "awareness watching awareness" meditation, I too experienced a strange sensation in the forehead. I do not know what it is...
But you just (correctly) defined what it is: an experience of a "strange" sensation". So you do know what it is. A sensation albeit strange. If you get into analysing gross vs subtle sensations, energy level vs physical level sensations, etc... then you have destroyed the purpose of your awareness meditation. Awareness (Shine/Samatha) meditation is awareness meditation, analytical (Vipassana/Lhaktong) meditation is analytical meditation.