Jesus Christ people...make a leap.
The point is "doing what he's supposed to be doing" is a lazy, dangerous and stupid statement.
R1 leading off first who gets hit by a screaming line drive, where he has no Godly chance whatsoever of avoiding contact, is "doing what he is supposed to be doing" and is still out.
There are dozens of cases where batters, runners, fielders and coaches are doing exactly what they're supposed to be doing , but still get penalized because the rules say so, and SH*# happens. (ie. no intent, no negligence, no chance)
"Doing what he's supposed to be doing" is a meaningless statement...and rarely matters....it should not be used in baseball....ever.