I'm not saying that it can't hurt them, but it's also nothing to really freak about. A small amount of air in the muscle isn't going to do anything.
If air in your muscle would kill you, then why don't you die if you get a deep cut? A shitload of air gets in there if you get a nice deep gash.
Also, if you have ever had an IV you'd notice all kinds of smaller air bubbles going into your bloodstream. These get broken up pretty quickly as well as the fact that your blood is going to straight up absorb a lot of the gasses anyway (Your blood is designed to carry CO2 and Oxygen after all)
So, get the big bubbles out, but a little isn't going to hurt you.
The people that have heard of someone die almost always are referencing
Um that would be first hand I have been around for 12 years and in that 12 years have heard and seen first hand the STUPID shit that guys do Yes little tiny bubbles wont kill you but your responce was just crazy "I shot half ass any way" it takes like 10CC to kill you bro did you know that a big enough BUBBLE which can be very small in your ass shoulder QUAD can stay there so when training and the muscle swells that Little bubble that has no where to go puts pressure on nerves, cause lose of feeling numbness HOW DO I KNOW becasue once apon a time I was new and listen to people and got the wrong advise OR miss understood what was said , that was a long time ago
It was how you posted your responce and the demeaner of the information !!
remember their are lots of guys that surf this board that read these posts and never ask questions and if they think air is ok than that information could harm someone