Home plate collision-with PU

[Hunter]

Last night I was at a PCL game between the Rivercats and the Grizzlies. Situation: R2, 2 outs. Line drive single to right, R2 rounds 3B, arrives at the plate just before ball, does not slide, avoids tag, then runs right into PU who is standing on the 1B side of the plate directly in runners path. R2 tries to hold up, but train wreck ensues. F2 stands over the pile with ball in hand, PU is under R2. No signal yet, F2 is standing looking at PU. BR now advances to 2B as F2 is napping. R2 gets up off of PU, and PU signals safe from his back. Catcher is irate, coach is furious, etc. No question to ask, just have never seen a collision like this that involved an umpire. BTW, PU took a few moments to get his bearings, and finished up game with out any problems.