Getting spiked at Marrowgar or multiple coldflames on top of you; Mind Controlled at Lady, chased by spirits; while DBS adds are down; during Vile Gas, when you're forced to move either for spores or to avoid Vile Gas; after getting hit by Malleable; when you get knocked far from the active Prince; During Flames/Incite Terror; when you have Unchained / are tombed; when you get Necrotic/Shadow Trap/Defile/Val'kyr-grabbed, have to reposition, inside FMC.
You can circumvent a number of these with your Demonic Portal and Nitro Boots, but even then, some of these events occur repeatedly during a single fight so you might find yourself out of options and having to walk.