I'm no expert here, but I'm not sure why you think this is High Frequency Trading. In my opinion, HFT is the type of move that happens in seconds when price moves counter-trend to the prevailing trend, and especially around key levels that others might be watching. What this does is run stops, and usually leads to a very quick reversal of this HFT orchestrated move. In other words, price might be in an uptrend, all of a sudden is pushed down, and as it drops, there are lots of limit order waiting to go long that are filled. Price recovers to the point of just before this little downdraft, and continues climbing. What this accomplishes is taking out the weak hands as they say. You have to wonder why price would drop for a just seconds, and why it could recover so quickly... ie. why are all those buy orders waiting there. If I see a little mini plunge, the last thing I want to do is start buying, unless of course I know that the little mini plunge is orchestrated.
If a move is huge, like 61 pips, especially if it breaks out above a range, then this is simply lots of buying. Yes its buying mostly by algos I would assume since computers do much of the trading, but when I think of HFTs, I think of moves designed to screw the retail trader who is tight with stops and might be nervous or not sure of where price is going.