CrPC Sec 145 Quagmire: Friend's Foes or Police Action?

So, mein dost aur main lagta hain ki humne 145th section par lecture di hi, lekin ab humne ek case mein lag liya hai. Kya police can suo motu arrest karega ya sirf dost ke FIR ko follow karega?

Scenario: Dost A aur B ke beech ek dispute raha hai, aur B ne police ko FIR dia hai, lekin dost A ke saath koi proof nahi hai. Police ab 145th section ke under suo motu arrest karegi ya sirf FIR ko follow karke investigation karega?

Dost ka kahta hai ki Section 145 clearly state karta hai ki police suo motu arrest kar sakti hai.