Here's what Wall had to say:
"This is my first time sitting out like this. I'm type of person who doesn't want to sit out too long, but also in this type of situation, practice is important, Summer League is important. But it's an injury that can be hurting you throughout the whole season so my coaches and training staff are doing a great job."
Makes sense -- there's no point in further aggravating something as serious as a groin injury. With Summer League games coming up, Wall should be just fine. But this may be something to pay attention to.