Iran perhaps feels imminently threatened or going on vengeance after the Suleimani blast.
The region as a whole is sitting on a powder keg and last thing anyone would want is to start a bilateral conflict, segwaying into the exiting one in Palestine.
My previous hunch was, after their last attack... using ballistic missiles as target practice, product demonstration and an exercise in deterrence.
However, this one reflects... they perhaps genuinely believe or perceive threat.
Pakistan though has been playing second fiddle to GCC and didn't step on any toes, less a living beat ... recede into a shell in fear of getting called out.
Anyhow, I don't think Pakistan will do much when they didn't do anything on a much brazen, potentially devastating and perhaps mishap/mistake ultimately of that Brahmos...
So... allow it time to fizzle out.