Not really comparable company profiles. Also as you say BHP down...

Not really comparable company profiles.
Also as you say BHP down to a third in a year. But TFC is down over 30% in a month. Weakened? More like smashed.
BHP involved in a major environmental and human disaster. TFC? Well we have had no announcements in some time which is totally out of character for TFC.
Over the years we have seen management buy up shares at these SP lows. But nothing recently.
Chart would suggest a good re entry soon, but that could well be less than a dollar within a week based on current trend.