Symbols in the Robots heads on Origins While In Zombie Blood?

I was on Origins the other day with two of my friends and during that I managed to get into the robots head whilst in zombie blood, once I did get there, I saw symbols inside of the head of the robot (Thor) where the wind staff piece would normally be, I don't know how I got this to activate but at the time we had three staffs built (one upgraded, ice) and we were just working on getting the other two staffs (wind and lightning) upgraded

anyone know what this is?