" Human interactions and Emotions " is what the normal person, Jeremy being no different, reacts to at receiving such a call in the early hours. Anyone's normal brain needs time for such events to sink in.
How would it have seemed to anyone that after receiving such a call that he was as steady as a rock and precise in making his next move/decision-----this being after wakening at 3 in the morning, or thereabouts ? At that stage, he hadn't known that anyone was dead and by all accounts he'd been familiar with Sheila having the odd meltdown which amounted to nothing when her father was able to calm her and prevent a disaster.
Any sudden rush on Jeremy's part would have indicated that it was either expected or that he'd done it and showed his willingness to help police like Huntley did in trying to cover his guilt !
The difference here, Lookout, is that I'm not just looking at one thing ie his reactions to an alleged call, (which actually are perfectly appropriate to a call which never happened because he had no sense of any urgency until he thought it might be appropriate to drop such into the conversation he was having with West) I'm looking at all his actions and his conversations. The deeper I've looked, the clearer it's become that Jeremy didn't know how to feel but watched the reaction of others to gain so sort of insight.
You appear to be saying -as you insist that "normal" brains need time to let such things sink in, that those of us who react appropriately aren't normal, but I'm sure I can't have that right. On the other hand you suggest he was used to dealing with this sort of thing from Sheila, so why such hesitancy on this occasion? No matter HOW hard you try to defend his reactions to that one incident, nothing will persuade me that he acted with any sort of concern. NO one, in an emergency, would NOT call 999. NO one would waste time going through a telephone directory and making abortive calls. NO one would ditch calling for help to phone a person too far away to be of any assistance. ALL of those actions were about DOING. NONE was about feeling.
I really don't get where your contrary comments come from. Rushing was required. It would NOT have indicated guilt, nor that he thought it was something expected (of him?) -however, he may well have thought long and hard about what might be the best way of 'doing' things to present himself in the best possible light. It didn't occur to him that he'd need to be able to feel it, too- furthermore we didn't have Ian Huntley as a yardstick.