If McHugh is not available, using Giles there makes a lot more sense. Who else would you have face the middle of the order with a runner on? Harris? Guduan?
Now that I think about it yeah the move does make more sense if McHugh isn't available, especially if McHugh is about to take Keuchel's spot.
I am Jack's complete lack of surprise. How many 2-strike counts today have ended up getting hits? Gotta be at least 7, I'd bet 4 of those started 0-2.