Jackharr, very sensible indeed! This was sector 3 of a 4 sector day, the cadet was PNF for first (well with me doing paperwork etc) and PF for 2nd and 3rd. The trainer thinking (at the time) home base and then AMS would not be too demanding.
If they had gone just below G/S (1/2 or 3/4 dot say) and then back onto it (plots show high ROD than slightly shallower than normal ROD briefly) you wouldn't get a glideslope call. The EGPWS would not go off as until the final moment terrain is not an issue. You are on profile, just (getting) low on speed. ROD was high but when above 1000ft and then on the high side but not to trigger a EGPWS. Stickshaker however they would have got in this scenario. Anyone would respond. Its all rumour but there is talk of the engines spooling up late on. Maybe just too late and not in time as they were spooling up from idle??
Dunno, its all speculation!