An echo game becomes surprisingly different when the reply starts later. A small delay can change the relationship between two parts without changing the pattern either person plays.
Establish a comfortable shared pulse
One person taps a short pattern while the other listens. The second repeats it after an agreed gap. Start slowly enough that both can keep the pulse comfortably, using hands or soft household sounds rather than loud impacts.
Repeat the same pattern several times with the same gap. When that feels clear, lengthen the gap by one pulse. Keep the sounds and the pattern unchanged so you can hear what the waiting does.
Listen to the overlap or separation
Depending on the phrase length and entry points, the parts may overlap or leave an obvious space. Describe what actually happened in your version instead of assuming every delayed reply works alike.
Swap roles and ask whether leading and answering felt different. If you make a recording, label the gap used in each take. A brief note such as “the reply arrived after I expected it” captures the point of the exercise: timing can become a musical relationship, even with very little material.