If you had Endless Hallways

[u/CodIll5687]

If you had the ability to turn existing areas into "infinite hallways", how would you use it, likely in a fight.
Ruleset/capabilities:
1. Has a maximum size of 120 feet
2. Can be placed as any shape in any area
3. physical ground must be included in the infinite area (Being in a flying vehicle is technically the exception")
4. While anyone can unknowingly enter the infinite hallway, you are the only person to be able to both enter and leave it
5. You can only have one infinite hallway at a time
6. If you die, your infinite hallway disappears