I will try to take a screen shot but cannot guarantee you because I do not know when my team or enemy team will pick wan wan when I pick Faramis. Also I think it will be very difficult to take the screen shot at the exact moment when the tower blink.
That is a great idea. However I am a solo player and so I am not willing to invite and talk with people. Please test it yourself if you have many friends. I am sure you will see the blinking one time or another.