Hah!
Epic!
Enemy 's located! I loved that!
And I find Grievous mechanical ticks/gimmicks very awesome! Converting him as a problematic cyborg that its time to be replaced. Also it adds some weird wicked personality. Maybe its just me ;)
Inspire from Robocop and Ed-209 could be a good reference ;)
Also in the clip id like to see the elevator coming down one more time to enhance the tension since we dont see the heroes watching it as it comes.
Great edit there :D
-Angel