Translation:The turtle slowly comes towards us.
I believe this is wrong as the sentence in this exercise does imply movement. Just as the posts in this discussion seem to be partially wrong or incomplete - and this may be the one you are referring to: https://forum.duolingo.com/comment/7396692/The-man-swims-towards-the-woman.
Or, maybe it was this one you were referring to: https://forum.duolingo.com/comment/4770586/We-run-towards-the-birds, which gives the link to 'henimod' in the dictionary but not to 'imod' so seems to not cover the answer well. Here's a link to 'imod' in the dictionary: https://ordnet.dk/ddo/ordbog?select=imod,2&query=imod. I can't find one of the descriptions to fit the use of 'imod' the way it's used in this exercise.
I found this discussion which gives the best answer, so far: https://forum.duolingo.com/comment/5338569/Modellen-kommer-imod-os, if it is correct.
There are several other discussions in Duolingo about these two words but they don't add anything useful. I don't think there's been a good comprehensive answer given yet. I'm wondering whether this is another of those cases where you just have to learn which word is used in which instance per the 'norm' (as in, "that's just the way we say it").