The $36, $38, and $43 price points (more or less) are areas I would expect to see heavy resistance/likely corrections, enroute to retesting $50/ounce ... which I think could easily happen in the next couple months.
I wouldn't buy ZSL "hoping" for a pullback. The only time I even think about buying it is after the blue line gets over the green line on the 4hr chart, and when it looks like it's about to do so on the 8hr chart. And the only way I'll hold ZSL overnight, for more than one night, is if silver is below the 18 day moving average.
Right now is NOT the time to be long ZSL. The bollinger bands have become constricted, indicating a major move is about to be made, either to the upside or downside. The charts are pretty much screaming that it is going to be to the upside. You want to be SHORT ZSL right now, not long.
there is a long term downward trend line that has not been broken yet. Look at the daily chart, draw a line from the top at the end of April and the top at the end of May. Right now it seems to be crossing at about $36. If it crosses above that line, you definitely don't want to be short.