A Drummer Region doesn't contin specific notes like a MIDI Region. Instead, it contains "play instructions" that you can set in the Drummer Editor. There are other parameter that affect the "play instructions", for example, the Arrangement Markers, and also the length of the Region. the drummer can play a fill at the end of a Region. If you have the Fill Parameter enabled on a 8-bar Region, then on the last bar (bar 8), the Drummer will play a fill. If youcut that Region in half, then bar 5 and bar 8 are the last bars of those Regions and it will play a fill there.
So, after the cutting, you will hear a fill at the end of bar 5 that wasn't there before.
Hope that helps
Edgar Rothermich - LogicProGEM.com
(Author of the "Graphically Enhanced Manuals")
http://DingDingMusic.com/Manuals/
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