frostbite | MUD client for dragonrealms | Game Engine library

In short, I'm currently working on developing a damage calculation system for my turn-based RPG project. I have one of the main functions completely developed; however, when I try to call it in a "For" loop, nothing prints to the terminal (the function returns multiple printed values) despite the function working perfectly fine when called on its own. I'm not really sure what the problem is, as I'm not getting an error of any kind. Any help would be much appreciated!

*Please note that the function is defined before I try to call it in my actual program (also, all of the tuples such as move_data have been imported from my other file within the project. The lists are also defined as well). I only pasted the function definition below the problem area to be more courteous to those willing to help me solve this problem.

Here is my current code (I know it's very long, so I apologize in advance):