It's pretty straight-forwards, actually, and literally.

Code executes linearly, line by line.

In the previous case, the caster is killed before summoning anything, whereas in the second case, the summoning is done before the caster is killed. If a caster is required for a summoning to occur (as I would suppose is the case), then of course, if the caster dies before the summoning occurs, the summoning will not occur.

i was thinking that was how it works to thanks for the clarification
but the problem came from that w40k mod that i was fideling around with
the uper example is how the mod used to do it and at some point these
modig commands got changed becose wen the mod was last updated
this still fuctioned