razorback is the worst sniper item lol, unless in degroot, dont use it
You need to be disguised when performing backstabs or sapping. Cloak is unusable for these situations. Even for the best spy it's hard to perform these as ENGINEERS ARE EXTREMELY PARANOID and pyros like protecting engineers.
why do you need to be diguised while backstabbing?
its easy to kill engis sentries, either stab then sap or do constant saps
lure the pyro away if theres one