Here, how the multi-ignition looks alike.

Conditions: idle, cold engine.


As we see:
a) at first, the one/first main ignition event happens;
b) after 20ms, 5(!) following secondary ignition events happen.

20ms by 600RPM correspond to around 70 degrees – so, secondary events are following close to the second part of the combustion stroke. Secondary ignition events are intended to better burn left-over fuel and improve the content of the emissions in the exhaust and in this mode (cold engine, work with enriched fuel) – to “dry” the spark plug if the misfire event has happened.