I disagree. Burger was pretty emphatic that she heard Reeva screaming (it woke her); then Oscar yelling for help; followed by screams that became blood-curdling and finally four shots with a pause between the first and the remaining three.
Viewing this crime as an intimate partner homicide, it isn't hard to imagine a controlling, jealous, perhaps psychologically abusive Oscar who argued with Reeva that night. Maybe she told him they were through. I believe she sought refuge in the toilet, with her phones, and maybe tried to reach out to someone for help. I believe they were arguing through that door and perhaps she stated she was calling the police, friends, etc - and I think Oscar 'snapped' and wanted to stop her at any cost. I haven't followed this case closely but I think we're going to hear about a history of controlling and domineering behaviours with a temper to boot. I could well be wrong though.
I think it was premeditated, legally anyway, but in an instant...more crime of passion than malice aforethought. It will prove interesting though because OP's entire defence strategy will rest upon ripping apart what is reasonable. The argument being that what is reasonable to an able-bodied person isn't the same to someone disabled.