Behind and Hard on the heels of

Behind adjective - Not arriving, occurring, or settled at the due, usual, or proper time.

Hard on the heels of and behind are semantically related. in after topic. In some cases you can use "Hard on the heels of" instead a preposition "Behind".

Behind and hard on the heels of are semantically related. Sometimes you can replace term "Behind" with "Hard on the heels of", this terms are similar.