system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU/Doctor Strange] why didn’t Dormammu just restrain Strange and.... go somewhere else?

Dormammu has this god knows how long string of PLANETS in this dimension he can go anywhere within. Why doesn’t he just string up Strange with his dimensional goo powers (we see him kill strange with this in numerous ways), cover his mouth, and ignore him? He knows Strange can only use his powers with hand movements, he can restrict his body entirely. If there are vocals only spells, he can cover his mouth. He also shows that he is aware of Strange’s time repeat before Strange walks up (he shows this after a few of the deaths, when he gets pissed about the repeat) so he can just restrict Strange the moment time repeats for any reason without even having to engage with him. 

It’s unclear whether the timeloop is for when Strange dies or after a set period of time (btw it doesn’t make any sense that they’re stuck in a timeloop when they are outside time but whatevs) but either way, Dormammu can restrict and mute strange immediately and just... go elsewhere in his vast dimension of planet sized trophies that Strange is a flea in comparison to and that’s being kind about the size difference. Strange is a fraction of a fraction of a speck on a trophy in a trophy hall, seems pretty easy to ignore.
gpt
It's entirely likely that in some of the repeats that we don't see that this happens. Dormammu ties up Dr Strange on sight, goes to carry out his plans and then...

Back in the Dark Dimension with Strange walking towards him. Okay, next time don't even engage the human, just try going somewhere else in the Dark Dimension to get away from this guy, this is so annoy-...

Back in the Dark Dimension with Strange walking towards him in exactly the same place.

We know that the spell isn't directly related to Doctor Strange being alive, and we see him cast it before the time loop begins. It's probable that Strange activated the loop to act over a certain area unless he personally chooses to deactivate it. Dormammu has no idea how to deal with time, let alone weird all-powerful time magic. It doesn't matter what Dormammu does after the time loop begins because 5 minutes later, he'll be exactly where he started watching a puny human with a glowing green bauble walking toward him.