Movement in Mowbray's Revenge has been designed to simulate the way the players moved and interacted in the original Marshmallow Duel game. This was always a big part of the game, and it could be a whole lot of fun without using any pickups at all, just trying to knock the enemy in the drink by running into them. Because the player movements will be a lot different to the default UT2k4 physics, it is a good idea to browse these explanations of the player's movements.
Stability and Instability
Air movement in Mowbray's Revenge takes two forms - stable and unstable. You can tell the difference by the way your character moves. When stable, you don't really have to worry too much about falling in the drink. You will land as normal. Unstable movement is a bit different - you will roll when you land to regain your balance. You become unstable by being knocked while in the air - touching another player in any way will make you unstable, as will colliding with a wall hard enough. While unstable, you also cannot grab onto ropes.
Crouching
Crouching is still fairly standard, just use your crouch key and the player will crouch. The difference is that like in the original game you will roll to a crouch if moving, instead of just ducking down like in most 3d shooter games. It is very useful in Mowbray's Revenge to duck when someone is aiming the gun at you, because if you are on the same level surface, they will not be able to hit you. Crouching also makes you much more stable, and if someone runs into you, instead of knocking you backwards, they will trip over you. If someone is chasing you it can be handy to crouch to trip them up, and then get away. You can't move when crouching.
vs rolling or jumping - Both players are knocked backwards.
vs running - The crouching player stays put, whilst the
running player trips up and flies over them.
Rolling
When you fall from a great height, or bounce off a wall or person, you will roll to a stop on the platform you land on. Basically if you become unstable you will roll when you land. This can be dangerous, especially if you are trying to land on a very small platform, because you may land and roll off the edge. You can also roll by crouching.
vs anything - Both players are knocked backwards.
Standing
Standing is what you do when you don't have anywhere to go, but you don't want to sit down!
vs rolling or jumping - Both players are knocked backwards.
vs running - The standing player is knocked away whilst the running player doesn't budge (so long as they only tap the standing player gently).
Running
Running just works as normal, I suppose.
vs crouching - Running player trips and keeps moving on forwards
whilst the crouching player stays put.
vs rolling, standing, jumping or running - Both players
are knocked backwards.
Jumping
Jump to get to other places, or evade other players.
vs anything - Both players are knocked backwards.