If I move into a battlefield and my opponent plays Hidden Blade from hand, can I play Fight or Flight or Ride the Wind to return to base?

Ruling: No, you cannot play Fight or Flight or Ride the Wind in response to Hidden Blade because they are all action speed spells and you cannot play action speed spells while there is a chain on the stack.

Sequence:

• You move into a battlefield
• Opponent plays Hidden Blade from hand (creating a chain)
• You cannot respond with action speed spells while the chain exists