[Magus] Cascading Ray clarification

[Fedorchik1536]

This line in Cascading Ray confuses me:

"Make a spell attack roll against the new target's AC, at the same multiple attack penalty as the Strike."

What Strike does it refers to? Is it referencing to Spelstrike, Spellstrike's Attack or your "current" attack?

If I start my round by making a Spellstrike against a foe, at what MAP Cascading Ray resolves if I use it as my next action?

[Blave]

It refers to Spellstrike. If it would just use your regular MAP, the whole half-seltence would be superfluous.

So if you do Spellstrike with your first two actions and fire a Cascading Ray with your third, the Ray will suffer no MAP.

Note that it will probably still have a lower attack bonus then the Strike since it's a spell attack and your spellcasting proficiency (and most likely intelligence) is lacking behind your weapon attack.