2/5, 7 handed, $500 effective with BB, $1k effective with BTN. BB is a complete unknown who just sat down, BTN is a loose passive fish.
OTTH
Hero opens HJ $20 J
T
, BTN calls, BB calls.
Flop ($62): J
T
5
. BB leads $60. Hero? Donking is almost always top pair or a draw, so I do expect BB to call here very frequently when raised. I also see a problem with calling in that an over may kill our hand or our action, and a 7, 8, or 9 may kill our hand. On the other hand, just calling could potentially bring in the BTN, and if we call and he slows down the turn, the SPR is low enough to play for stacks by the river.