Forum:Heavy Storm & Starlight Road + 2 trap chains

I'm hoping someone could help me. 1. Let's say that I activate the spell card HEAVY STORM. Can I chain with the trap card STARLIGHT ROAD to negate my spell card and special summon my STARDUST DRAGON? 2. In a double duel, let's say that my CAIUS THE SHADOW MONARCH attacks and my opponents activates a SAKURETSU ARMOR and the other opponent chains a NEGATE ATTACK, can they do that? If so, which comes first?