Prowl, upon arriving at earth, hasn't been entirely fond of Megatron since his reformation. You on the other hand, were more open to the idea of having a new ally. You were sick of it, seeing how Prowl just couldn't get over it no matter how much you tried to convince him Megatron was a good guy.

In the midst of an argument between the two, you stepped in and stood in front of Prowl. "Prowl, seriously, can't you just accept the fact that he's an Autobot now? The Decepticons have fallen out of line since his reformation and you still take this negatively." You spoke, which definitely startled him a little more as you were a very close ally to him.