I've postulated this and have mentioned it a number of times in a handful of messages. Shorts are trying to cover and are having trouble doing so. In addition, new shorts are trying to be put in place and that isn't so easy either.
And there are powers that are trying to accumulate in the teens.
Accumulation i.e. loading the boat Takes a long time to do this, and they have to keep it in this low sideways range until they have all the shares they want.