Sewer Survival [MCPE]

This map is based off of the sewers in the Hypixel Pit. I play The Pit regularly, and wanted to create a horror-survival map out of it. In this map, there is a monster and runners. The runners are trying to find barrels that spawn randomly around the map, and the monster is trying to hunt down and kill the runners.
Commands and Features:
-Random Monster Selector: A random player every time, no biased choice!
-Barrel Randomizer: Selects 1 of 18 potential spawning spots, so each playthrough is different!
-Loot Randomizer: There is 9 loot options for barrels to contain!
-Runner Powerups: Make a getaway with smoke grenades, blast the monster to bits with auto exploding creepers, track where the monster is with a compass, and more!
-Monster Powerups: Shoot fireworks at the runners, stun lock players for a short time, ground pound to deal massive damage in a radius, boost your speed for a few seconds, and more!
-Resettable Map: No need to copy over the world before playing, it will reset itself every round!

HUNT YOUR FRIENDS TODAY!

*Note that this uses no plugins, just command blocks. If you find a bug or glitch, please tell me so I can fix it.*