Baseball Reference has BABIP as:
(H - HR) / (AB - HR - K + SacFlies)
If I understood dproc0219's question correctly, he's asking if this results from something anomalous happening with Hill's HR, K or SacFlies totals, such that all his hits are hits that "put the ball in play".
Here are the actual numbers for Hill as I have them today:
(195 - 36) / (678 - 36 - 97 + 4)
That yields:
159 / 549 = .2896
Compare with Batting Average (H/AB):
195 / 678 = .2876
The reason for the roughly similar averages is that both the numerator and the denominator happen to drop by the same rough amount of 22-23% from the BA to the BABIP.
So, no, not all of his hits are "balls in play"...it's that his non-HR hits are in the same ratio to balls in play that his total hits are to his At-Bats.