I am traveling at .5c towards you. I turn on a light aimed at you.
In one second, how far did the light travel? 186,000 miles? OK
How far did I travel in that same second, 93,000 miles? Good.
The light is ahead of me 93,000 miles in one second.
The light is 186,000 miles closer to you in one second.
I am 93,000 miles closer to you.
The light appears to be traveling at .5c away from me from my perspective, as in the one second duration, the light goes from me to 93,000 miles in front of me. That means my perception (illusion) is that the light is traveling at .5c.
The light is coming towards you at c, BUT, depending on how far away I am from you when I turn the light on, you will not even see the light until it arrives at you, which is a delay from when I turn on the light and when you perceive the light was turned on. During that delay (which is proportional to the distance I am away from you), I traveled a distance, and the light traveled a distance. Your perception and my perception are wrong, they are both illusions that don't represent the reality that the light traveled 186,000 miles in one second, and I traveled 93,000 miles in that same second.
You don't even see the light until it hits you, so your observation doesn't begin until the light hits you, which at that point the light is not a distance away from you. If the light continues on its path beyond you, you can then observe the velocity of the light traveling away from you while I continue to travel towards you.