If 3 deer come within shooting range and you take the big one, the likely hood is that you killed the mother Doe.
I'd caution people on this strategy......and plead that everyone carry binos afield to thwart this occurring.
Rob/PA was here in '06 hunting and I had this EXACT scenario occur. I had mama and 2 fawns come right under me. I reached for the bow.....started to draw. I put it back on the hook. The largest deer was the one I had a clear shot at (they walked literally right under me....and no chance to draw). I focused on the larger one as the other two fed away.
The larger one WAS the BB